When: 2008-06-13

Collection location: Lake Bistineau State Park, Webster Parish, Louisiana, USA [Click for map]

Who: Ron Pastorino (Ronpast)

No specimen available

Two of these mushrooms were found in the same general area among mostly mixed hardwoods. They have the appearance of a Caulorhiza species in that they had a deep “tap root”. I got most of the smaller one.
They differ from the western C. umbonata in that the cap color is more yellow and the spores were definitely a light yellow rather than white. Also by my estimation the spores appeared to be at least twice as large.
Edit 2-7-2014; Checked spores from print.
Spores~ 13.2-16.0 X 9.2-10.9 microns.
Q(ave) = 1.50.


Proposed Names

-20% (3)
Recognized by sight
24% (5)
Recognized by sight: The change in thickness of the stipe seems like Xerula.
-3% (3)
Recognized by sight: This is a common mushroom throughout the south eastern area usually on berried roots or hardwood stumps The xerula magalospora have very large spores.
52% (3)
Recognized by sight
56% (1)
Recognized by sight: Yellowish cap, stem texture
Based on microscopic features: Spore size and shape

Please login to propose your own names and vote on existing names.

= Observer’s choice
= Current consensus


Add Comment
Walt, I want to believe these consistantly bright yellow
By: Ron Pastorino (Ronpast)
2016-12-24 10:13:45 PST (-0800)

Hymenopellis observations from the SE are something different from the brownish H. incognita. I haven’t seen the official description for H. sinapicolor, but according to Kuo, they have significantly smaller spores, which these and others I’ve found don’t(?)

By: walt sturgeon (Mycowalt)
2013-01-27 07:37:10 PST (-0800)

It fits H. megalospora but see comments below.


It is occasional in the central Appalachians and foothills. If not a good species, it should in my opinion deserve a varietal rank.

Not convinced its X. megalospora
By: Ron Pastorino (Ronpast)
2009-11-28 18:16:42 PST (-0800)

All the references I’ve found for that species show a mushroom with whitish, buff, creamy to brownish-gray caps. None mention a yellow to bright yellow cap. The same mushroom seems to appear in MO# 6178 from West Virginia and the local experts/mycologists did not have a name for it.

West Va.—west La. connection
By: Ron Pastorino (Ronpast)
2008-06-23 15:07:46 PDT (-0700)

I knew there was something familiar about those mushrooms. They definitely appear to be the same species so I’ll go with the Xerula sp. until somebody comes up with something better.

Xerula sp.
By: Dimitar Bojantchev (dimitar)
2008-06-23 11:32:12 PDT (-0700)

Xerula it seems like. It is highly unlikely that this one is the European Xerula radicata, but it does look like it a bit — http://mushroomhobby.com/Gallery/Marasmius/index.htm#Xerula_radicata

These do have interesting cystidia to look at. Never seen one on the West Coast though.

Xerula sp. (unnamed)
By: Debbie Viess (amanitarita)
2008-06-23 07:38:15 PDT (-0700)

This looks grossly identical to a yellow Xerula sp. that Rytas Vilgalys took back with him to Duke last summer for DNA sequencing. We found it at the NAMA W.VA foray, and Bill Roody claimed that it has been collected in the South with some regularity. Here’s a link to my original observation on MO: