Observation 55400: Ossicaulis lignatilis (Pers.) Redhead & Ginns

When: 2010-10-12

Collection location: Strouds Run State Park, Athens, Ohio, USA [Click for map]

Who: Dan Molter (shroomydan)

No specimen available

These mushrooms were a lot harder than I expected them to be. The flesh is firm and difficult to break. they were growing inside the rotting stump of a fallen sycamore tree.



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Inside the log or stump
By: walt sturgeon (Mycowalt)
2010-10-14 01:21:53 CEST (+0200)

That’s where this species often fruits. I like the Peck name Pleurotus abscondens. An absconding mushroom. Good stuff!

By: Irene Andersson (irenea)
2010-10-13 21:13:24 CEST (+0200)

Big mistake by ZipcodeZoo, they must have mixed up Agaricus circinatus Fries (=Ossicaulis lignatilis) and Agaricus circinatus Schumacher (=Amanita rubescens, the dark-capped form).

Amanita rubescens ?
By: Dan Molter (shroomydan)
2010-10-13 20:35:03 CEST (+0200)

Thanks for the ID Irene. Once upon a time somebody described this species as a variety of Amanita rubescens. That seems very strange.

here is a list of synonyms from ZipcodeZoo:

1. Agaricus circinatus Fr. 1834 2. Agaricus lignatilis Pers. 1801 3. Amanita rubescens var. circinata (Pers.) Sacc. 1887 4. Clitocybe lignatilis (Pers.) P. Karst. 1879 5. Hypsizygus circinatus (Fr.) Singer 1951 6. Nothopanus lignatilis (Pers.) Bon 1986 7. Pleurocybella lignatilis (Pers.) Singer 1947 8. Pleurotus circinatus (Fr.) Sacc. 1887 9. Pleurotus lignatilis (Pers.) P. Kumm. 1871 10. Pleurotus lignatilis var. tephrocephalus Sacc. 1887
polymorphic mushroom
By: Dan Molter (shroomydan)
2010-10-13 16:10:14 CEST (+0200)

Hi Walt,

These were all growing from a single rotting sycamore. Gill attachment does seem to be variable, but not as variable as the location and size of the stem. Some were growing like oyster mushrooms with no stem at all, while others were like agarics with a central stipe.

All mushrooms had a similar feel and smell, and all were dusted with snow-white spores. All of them were also growing within a few feet of each other on the same piece of wood. I think they are all the same.

Mixed collection?
By: walt sturgeon (Mycowalt)
2010-10-13 16:00:43 CEST (+0200)

Can’t tell from the photos but gill attachment looks decurrent on some of the fruiting bodies.

Created: 2010-10-13 02:44:03 CEST (+0200)
Last modified: 2010-10-13 20:30:44 CEST (+0200)
Viewed: 146 times, last viewed: 2018-01-12 04:31:08 CET (+0100)
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