Collybia cookei
| Collybia cookei | |
|---|---|
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| Scientific classification | |
| Kingdom: | Fungi |
| Division: | Basidiomycota |
| Class: | Agaricomycetes |
| Order: | Agaricales |
| Family: | Tricholomataceae |
| Genus: | Collybia |
| Species: | C. cookei |
| Binomial name | |
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Collybia cookei (Bres.) J.D.Arnold (1935) |
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| Synonyms | |
| Collybia cookei | |
|---|---|
| Mycological characteristics | |
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gills on hymenium |
 
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cap is convex or flat |
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hymenium is adnate |
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stipe is bare |
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spore print is white |
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ecology is saprotrophic |
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edibility: unknown |
cap is convex
Collybia cookei is a species of fungus in the Tricholomataceae family, and one of three species in the genus Collybia. It is known from Europe, Asia, and North America. The fungus produces fruit bodies that usually grow on the decomposing remains of other mushrooms, like Meripilus giganteus, Inonotus hispidus, or species of Russula; occasionally fruit bodies are found on rich humus or well-decayed wood. The fungus produces small white mushrooms with caps up to 9 mm (0.35 in) in diameter, supported by thin stems that originate from a yellowish-brown sclerotium. The mushroom is difficult to distinguish from the other two species of Collybia unless an effort is made to examine the sclerotia, which is usually buried in the substrate. The edibility of the mushroom has not been determined.
Collybia cookei
The species was first described in the scientific literature in 1928 as Collybia cirrhata var. cookei by the Italian mycologist Giacomo Bresadola. In a 1935 publication, Jean D. Arnold reported a series of cultural studies with monokaryon isolates (hypha having only a single haploid nucleus) of several Collybia species to determine their mating type. All attempts to produce hybrids between C. cirrhata var. cookei and C. cirrata or mycelial fusions between the two species failed. This sexual incompatibility indicated that the two taxa were separate species, and she raised the taxon from varietal to specific status, calling it Collybia cookei. The species has also been called Microcollybia cookei in a 1979 publication by Joanne Lennox, but the genus Microcollybia has since been folded into Collybia.Marcel Bon and Régis Courtecuisse considered the species a variety of Collybia tuberosa in a 1988 publication. A 2001 molecular analysis based on the ribosomal DNA sequences confirmed that C. cookei is phylogenetically related to C. tuberosa and C. cirrhata, and that the three species form a monophyletic group that comprise the genus Collybia.
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