When: 2009-09-28

Collection location: The New York Botanical Garden, Bronx, New York, USA [Click for map]

Who: Roy Halling (royh)

Specimen available

In the populations that occur on the grounds of the NYBG, the sclerotia are typically deeply buried in wood chip mulched flower beds. The stipes taper below the mulch-soil interface and are radicating to the sclerotia. The upright basidiomes have faded at the pileus margin. Sclerotia are seen in the lower right and lower left of the images. The second image has a sclerotium cut open.
Herbarium specimen in NY (RE Halling #9239)

[admin – Sat Aug 14 01:57:18 +0000 2010]: Changed location name from ‘The New York Botanical Garden, Bronx, Bronx Co., New York, USA’ to ‘The New York Botanical Garden, Bronx, New York, USA’

Species Lists


Sclerotium cut open.

Proposed Names

84% (1)
Recognized by sight: Occurs in flower beds mulched with wood chips. Arising from buried sclerotia.

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= Observer’s choice
= Current consensus


Add Comment
Indeed, Walt…
By: Roy Halling (royh)
2009-09-29 04:05:43 CEST (+0200)

and that’s where it occurred when I saw it last 20 years ago. As I remember, A. arvalis is yellow and the sclerotium is a different shape. Spores are brown and the pileipellis is hymeniform.

In Ohio
By: walt sturgeon (Mycowalt)
2009-09-29 02:42:46 CEST (+0200)

I have seen Agrocybe arvalis in wood mulch.

According to the original
By: Roy Halling (royh)
2009-09-28 23:45:25 CEST (+0200)

description, Redhead and Kroeger state that it is the only Hypholoma that grows from a sclerotium. They also mention that Agrocybe arvalis also fruits from a sclerotium. This latter used to occur on the NYBG grounds, but I haven’t seen it in 20 years.

By: Debbie Viess (amanitarita)
2009-09-28 23:09:07 CEST (+0200)

Do other species of Hypholoma also grow from sclerotia?