Rhodocollybia
| Rhodocollybia | |
|---|---|
 |
|
| Rhodocollybia butyracea | |
| Scientific classification | |
| Kingdom: | Fungi |
| Division: | Basidiomycota |
| Class: | Agaricomycetes |
| Order: | Agaricales |
| Family: | Marasmiaceae |
| Genus: |
Rhodocollybia Singer |
| Type species | |
|
Rhodocollybia maculata (Fr.) Singer |
|
| Species | |
|
Approx. 30 species – see text. |
|
Approx. 30 species – see text.
Rhodocollybia is a genus of Basidiomycete mushroom. Species in this genus, formerly classified as a subgenus in Collybia, have fairly large caps (typically larger than 5 centimetres (2.0 in) broad), and have a pinkish-tinted spore print. Microscopically, they are characterized by having spores and basidia that are dextrinoid—staining deep reddish to reddish-brown with Melzer's reagent when tested for amyloidity. Rhodocollybia species are commonly found in temperate North America and Europe, and infrequently in Central and South America.
The genus name Rhodocollybia was first used by Rolf Singer in 1939 to describe those species of Collybia with a pink spore deposit; in later works he considered the genera equivalent (synonymous) and called them Collybia. In 1997, Antonín and Noordeloos studied various members of Collybia using phylogenetic analysis, and reorganized the genus, dividing species into either Collybia, Gymnopus, and Rhodocollybia.
The caps of species in this genus are relatively large, often more than 5 centimetres (2.0 in) in diameter, convex in shape but in maturity flattening, or often developing a shallow umbo–a mound in the center of the cap. The surface of the cap is often uneven, and slimy or slippery () to the touch. The cap color can range from whitish to dark reddish brown. The gills are whitish to pinkish cream in color, and have an attachment to the stem. The stem is usually long and thick (relative to the cap diameter), often more than 7 centimetres (2.8 in) long and at least 0.5 centimetres (0.2 in) thick; the color usually whitish or the same color as the gills. This type of agaric, collybioid mushroom has pale spore deposits which range from pinkish buff to pinkish cream.
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