When she was just a young bud, Earthstar had pushed herself up from her parent mycelium through the woody humus then cracked open her outer shell to reveal her inner spore sac and beaked mouth. The outer shell formed arms of a ‘star’ that pushed back, raising her up to meet the world. When she surveyed her mossy terrain, she noticed that she was one of the earliest earthstars to emerge. Most of her sisters were still budding through the moss and duff. She was eager to fulfill her path. Soon she would be ready to deliver her precious spores to the world—
“Hey there!” a beaky voice called to her.
Earthstar recognized a Beaked Earthstar ambling along the rot pile using its outer skin ‘legs.’ She herself was a Collared Earthstar, and although she had long dislodged from the woody soil and become independent of the ground she sat on, she didn’t normally walk about like this Beaked Earthstar, known for its itinerant lifestyle. He was a rare and somewhat mysterious earthstar, not often seen, and somewhat of a legend. In fact, it was the first time she saw him and she felt tickled that he’d stopped in his wanderings to greet her.
“I’m on my way to town,” said Beaky cheerfully. “Want to come along? There’s so much more to see than this silly forest.”
“No thanks,” said Earthstar, overcoming the flush of excitement at being invited by this exotic drifter. She’d heard about ‘the town’ but knew nothing of it—and decided she didn’t want to. Besides, the forest wasn’t silly, she thought peevishly. It was her home. It nourished her. It was where her family was. Earthstar was content.
“Suit yourself,” said Beaky. “But you don’t know what you’re missing! There’s a river out there, and strange but wonderful creatures and moving things on wheels that carry them from place to place. And the fine ladies have something called ‘High Tea,’ which is quite splendid.”
“I think this forest is quite splendid enough,” she retorted a little rudely.
What did Beaky mean by his last comment? wondered Earthstar. How can one be out of place? And why would one wish to be? As time went by, Earthstar began to wonder about that ‘somewhere’ and those wonderful creatures and fine ladies and that thing called ‘High Tea.’ And before she realized it, she was no longer content. She became very curious about that ‘somewhere’ that lay beyond her forest home.
In a sudden thrilling act, Earthstar decided to leave the forest to see the world. And once she thought of it, she did it. That’s the way of earthstars. So, within moments, Earthstar was wandering along the same forest path that Beaky had earlier taken. She took Moss with her, tucked safely inside her ‘legs’ as companion.
Earthstar was snatched off the ground before Marcus could step on her and gently cupped in the girl’s hand where the little fungus felt finally safe. “It’s an earthstar!” said the girl holding her. “How cute! See the bit of moss clutched in its arm? How adorable!”
“But, Emily, what d’you think it’s doing here on the trail by the school?” Marcus asked the girl holding Earthstar. “How did it get here?” Marcus suddenly grinned with inspiration and turned to Lillie, eyes sparkling. “Or did your giant space tardigrade drop it here? Which means we’re in your story–“
Lillie elbowed him and said something Earthstar didn’t understand.
Emily looked down at Earthstar, who sat quietly in her palm. “They’re the only mushrooms that move. Earthstars. I’ve read about them.” Emily then bent low and carefully set Earthstar on the grass by the trail, out of harm’s way.
“Maybe it’s on ‘walkabout,’” Lillie suggested, inspired by the thought of travel.
“You mean floatabout!” Marcus laughed. “If it came all the way from Australia it’d have to float across the Pacific Ocean!”
The students giggled, visualizing little Earthstar floating on a leaf and braving the vast ocean then hitchhiking across the North American continent into the Kawarthas. Still discussing the earthstar’s epic journey, they went on their way, leaving Earthstar on the grass.
Earthstar continued her journey, wondering what ‘walkabout’ meant. She found another large building and thought this might be where she needed to go. When one of the giant beings walked out through a door, she slid inside.
She found herself in a wonderfully lit atrium with many more doors and lost herself among the indoor plants under large skylights. Within moments, as if sensing her presence, one of the large beings stepped out from a doorway and immediately saw Earthstar, perched by one of the indoor gardens.
“Well, well, what do we have here? A wandering earthstar and her little moss companion!” The being picked Earthstar up and gently cupped Earthstar in its hand. “Would you like to join me for tea?”
The magic word! Tea!
Earthstar jiggled on her ‘legs’ with joy. Was this being one of those fine ladies? As if sensing her excitement, the lady smiled and brought Earthstar inside her apartment.
The lady brought them outside to the patio for tea, where she had laid out tiny sandwiches, cheeses, crackers, scones with jam, and lovely pastries. Of course, Earthstar did not partake in these strange foods—being a saprophyte, she fed exclusively on decaying matter. But she enjoyed the ambience of this civilized celebration. And, of course, the tea!
“Mine!” he shouted to himself and bounded away with her clutched in his mouth. After waiting for an oncoming bicycle, he raced across the trail–just inches in front of the zooming bicycle (squirrels are daredevils at heart)–and entered the little wood by the river.
The black squirrel took his prize to a huge old willow tree by the river. The tree bowed over a small path as if reaching down to say hello. The squirrel left Earthstar on the bowing tree to dry like he would any mushroom for later caching. Then he scurried away to look for more food. What this city squirrel didn’t know was that—unlike most other mushrooms—earthstars can move!
The Trent Nature Sanctuary
Located in the southeast corner of Symons Campus of Trent University, the Wildlife Sanctuary Nature Area includes many types of ecosystems and a network of trails. Wetlands of the area are deemed Provincially Significant by the Ontario Ministry of Natural Resources and Forestry. The cedar/maple swamps of the sanctuary support a rich diversity of fungi and lichen amid a rich ecosystem of plants and animals of the forest. It is within this area that I keep discovering interesting life each time I visit. Virtually all the images of the forest and fungi in this article come from this sanctuary, including the Collared Earthstar.
Information on the Collared Earthstar (Geastrum triplex)
Collared Earthstar Life Cycle
The Collared Earthstar (Geastrum triplex) is a Gasteromycete or stomach fungus, since it produces and releases its spores inside a saclike structure. The earthstar spends most of the year as a network of fungal cells (mycelia) that penetrate the soil and digest decaying organic material. When they are ready to reproduce, the mycelium develops the “earthstar” above ground. New earthstars emerge as ‘buds’ and develop in late summer and autumn through into winter. The matured fruiting bodies will survive the winter to be discovered the following spring by curious explorers like me.
Geo means earth and astrum means star. The species name triplex, which means ‘having three layers,’ refers to the way the ‘star’ arms of the outer layer crack when they peel back, making it look like the spore-sac is sitting on a dish. The three layers allow the earthstar to do something no other fungus can do: move. When it rains, the two outer layers of the peridium split and peel back, forming a ‘star’ with 4-12 rays. The rays spread with enough force to push aside leaves, raising the spore-filled sac above the surrounding debris. The rays often lift the earthstar high enough to break the connection to the parent mycelium, releasing the earthstar from its sedentary position. Detached, the earthstar can move with wind or rain to better spread its spores.
Fruiting bodies are large, 5-10 cm in diameter. Spores escape from the apical pointed hole (peristome) as breezes blow across it. Much larger puffs are released when raindrops hit and compress the spore-sac—or an interfering finger depresses the sac. What escapes is a powdery gleba (which distributes the tiny spores). The sides of the peristome ‘beak’ are fibrous and appear slightly ragged.
After a late summer / autumn rain, the collared earthstar emerges from the leaf litter looking like a Hershey’s kiss or a fancy bulb-shaped truffle dusted in fine cocoa. Only the outer layer (exoperidium) is visible, peeking out of the litter and loam. The outer layer eventually cracks open, looking like a coconut husk and splits into five to seven ‘arms’ to form a star. Inside is revealed a tan to grey-coloured spore-sac (endoperidium) with a fringed beak (peristome) and its opening (ostiole). The endoperidium, or spore sac, is more like an elastic membrane resembling rubber that holds the gleba (spore-bearing mass). The star arms peel back and down, eventually cracking to form the ‘saucer’ which the round fruiting body (spore sac) sits on. The spore sac contains a mass of spores and fertile mycelial tissue, called the gleba that is white, fibrous and firm when young, but turns brown and powdery as it ages. A network of cells (capillatum) help spores move to the pore when a raindrop strikes the endoperidium. The columella, a bulbous sterile base at the centre of the spore-producing gleba forms ‘columns’ that radiate out to help spore dispersal.
Over time, the outer layer of ‘stars’ (exoperidium) form a reticulated pattern of cracks and fissures that deepen into golden-brown colours as they decompose and curl downward to lift the spore-sac farther up. The sac also grows more pale and papery.
However, in the rain, the sac reverts to a rubbery consistency and deepens to a dark shiny tan colour. I was surprised by its elasticity; this time when I poked it, the sac sprang back to its round sphere like a thick balloon.
Collared Earthstar Habitat
I also learned that the collared earthstar prefers a habitat of leaf litter in deciduous woods, especially beech on chalky soils. However, researchers acknowledge that the collared earthstar is also found under coniferous trees, especially on sloping ground—which better describes where I found them, in this cedar-birch forest of the Kawarthas. Geastrum triplex is a saprophytic organism: it gets its nutrients from decomposing organic matter—such as well-rotted cedar trees, where humus has accumulated—by further breaking down the organic matter then, in turn, returns those nutrients to the soil to complete the cycle. It does this by releasing enzymes to break down and digest the lignin, cellulose or chitin in these materials, converting them to soluble compounds that can be absorbed by them, and by plants, as nutrients. Earthstars, like all fungi, play a vital role in reducing the accumulation of dead organic material and in recycling essential nutrients, particularly carbon and nitrogen. If not for fungi, forests would choke under a mountain of logs and leaves.
Ellis JB, Ellis MB. 1990. “Fungi without Gills (Hymenomycetes and Gasteromycetes): an Identification Handbook. ”Chapman and Hall. London. ISBN 0-412-36970-2.
First Nature. “Geastrum triplexJungh.—Collared Earthstar” Online: https://www.first-nature.com/fungi/geastrum-triplex.php
Kirk, Paul M., Paul F. Cannon, David W. Minter and J. A. Stalpers. 2008. “Dictionary of the Fungi.” CABI, 2008
Kuo M. 2008. “Geastrum triplex“. MushroomExpert.Com.
Roel, Thomas. 2017. “#044: Mushroom Morphology: Earthstars.” Fungus Fact Friday.
Roody WC. 2003. “Mushrooms of West Virginia and the Central Appalachians.” University Press of Kentucky, Lexington, KY. p. 443. ISBN 0-8131-9039-8.
Torpoco V, Garbarino JA (1998). “Studies on Chilean fungi. I. Metabolites from Geastrum triplex Jungh”. Boletin de la Sociedad Chilena de Quimica. 43 (2): 227–29.
Woodland Trust. “Collared Earthstar.” Online: https://www.woodlandtrust.org.uk/trees-woods-and-wildlife/fungi-and-lichens/collared-earthstar/
Pegler, D.N., Laessoe, T. & Spooner, B.M. 1995. “British Puffballs, Earthstars and Stinkhorns.”Royal Botanic Gardens, Kew.
Utah State University. “Earthstars.” Online: https://www.usu.edu/herbarium/education/fun-facts-about-fungi/earth-stars
Nina Munteanu is a Canadian ecologist / limnologist and novelist. She is co-editor of Europa SF and currently teaches writing courses at George Brown College and the University of Toronto. Visit www.ninamunteanu.ca for the latest on her books. Nina’s bilingual “La natura dell’acqua / The Way of Water” was published by Mincione Edizioni in Rome. Her non-fiction book “Water Is…” by Pixl Press(Vancouver) was selected by Margaret Atwood in the New York Times‘Year in Reading’ and was chosen as the 2017 Summer Read by Water Canada. Her novel “A Diary in the Age of Water” was released by Inanna Publications (Toronto) in June 2020.