fungus

(Cotylidia diaphana)

Conservation Status

IUCN Red List

not listed

NatureServe

not listed

Minnesota

not listed

 
fungus (Cotylidia diaphana)
Photo by Greg Watson
 
Description

Cotylidia diaphana is a pale, easily overlooked, medium-sized, terrestrial fungus. It occurs in North America and Central America. It has been reported in South America, but due to a previous confusion with Cotylidia aurantiaca, those records are unverified. There are also a handful of widely scattered records, and many citizen science observations, in Asia. In the United States it occurs in the northeast, in the Upper Midwest, and on the West Coast.

Cotylidia diaphana is found in summer and fall, in moist deciduous woodlands, usually alone but sometimes in groups. It grows on the ground among humus and woody debris or on the wood of hardwood trees.

The fruiting body consists of a cap and a well-developed stalk, which differentiates it from fungi in the genus Stereum. It is erect, thin, leathery, and tough.

The cap is to 1 916 (15 to 40 mm) long and 516 to 1 316 (8 to 30 mm) wide. It is almost always vase shaped, funnel shaped, or cone shaped, rarely spatula shaped. It is sometimes deeply split into petal-like lobes that fuse together. When in groups, it may fuse to adjacent fruiting bodies. It is white to pale cream colored when fresh. As it ages, it becomes straw-colored, sometimes with obscure, concentric, darker zones. The upper surface is dry and either smooth or with fine, radiating fibers (fibrils). The margin is thin and may be smooth or roughly toothed (lacerate). The lower, spore-bearing surface is white to pale yellowish brown when fresh, sometimes becoming pale reddish brown with age. The spore surface usually continues down the stalk.

The stalk is white, slender, cylindric, 516 to ¾ (8 to 20 mm) long, and 132 to (1 to 4 mm) thick. It is covered toward the base with white, velvety, downy, or woolly hairs that bind to the soil creating a ball.

The flesh is small, thin, and insubstantial.

The spore print is whitish.

 

Similar Species

 
Habitat and Hosts

Deciduous woodlands

Ecology

Season

Summer and fall

Distribution

Distribution Map

 

Sources

4, 24, 26, 29, 30, 77.

12/17/2024    
     

Occurrence

 

Taxonomy

Kingdom

Fungi (fungi)

Subkingdom

Dikarya

Phylum

Basidiomycota (club fungi)

Subphylum

Agaricomycotina (jelly fungi, yeasts, and mushrooms)

Class

Agaricomycetes (mushrooms, bracket fungi, puffballs, and allies)

Order

Hymenochaetales

Family

Rickenellaceae

Genus

Cotylidia

 

 

Subordinate Taxa

 

   

Synonyms

Podoscypha diaphana

Stereum diaphanum

Stereum willeyi

Thelephora diaphana

Thelephora sullivantii

Thelephora willeyi

   

Common Names

This species was formerly classified as Stereum diaphanum and was known by the common name “Stalked Stereum.” It was later moved to the genus Cotylidia, and the former common name is no longer appropriate. It now has no common name.

 

 

 

 

 

 

 

 

 

 

 

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Greg Watson

Cotylidia diaphana

I took the attached pictures of Cotylidia diaphana on the trail up to Sugar Loaf in Winona on October 1st.

fungus (Cotylidia diaphana)  

fungus (Cotylidia diaphana)

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Cotylidia diaphana
Aktas Gurzoglu

About

Dec 5, 2020

ilk defa karşılaştığım nadir bir tür sanırım.

Google Translate: I think this is a rare species that I have encountered for the first time.

 

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Greg Watson
10/1/2024

Location: Winona, MN

fungus (Cotylidia diaphana)
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Created: 12/17/2024

Last Updated:

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