Macro: Five specimens from a patch of mushrooms found beside the road near the Fannin Battleground in Goliad County, Texas. They were low growing in mown grass and scattered in an area of about 400 square feet. There were no nearby trees. The mature caps were more or less flat, disk-shaped and small. Cap-disk measurements in cm for widest and narrowest dimension were 3.4×2.5, 2.9×2.8, 3.0×2.8, 4.0×3.6, and 4.6×3.8. Cap tops were of a burnt-sugar brown color (RGB 105, 87, 87) and the cap surface was a bit scaly. Gills and stipe were brown. Cap margins appeared eroded so that the gills seemed to hang down from the edge (see attached photos). Stipe lengths were from 2 to 3cm and the diameters were from 5 to 7mm and tapering toward the apex. No color change was observed from bruising. Evidence of a ring was found on two specimens. There was no evidence of latex. The odor was similar to Agaricus bisporus. No color change was observed after the application of KOH, NH4OH, and FeSo4.
Micro: One spore was measured to be 8.7µm x 6.2 µm.
Collector’s_Name: Robert Benson
Substrate: Turf
Habitat: Roadside
Geology: Quaternary, Middle Pleistocene: Unconsolidated fine-detrital clay, Unconsolidated fine-detrital silt, and Unconsolidated Coarse-detrital Sand.
Sand, silt, clay, and minor amount of gravel. Iron oxide and iron-manganese nodules common in zone of weathering; locally calcareous. Surface fairly flat and featureless except for many shallow depressions and pimple mounds. Moore and Wermund (1993a) mapped three units—(1) alluvium undifferentiated as to texture and origin—includes meander belt, levee, crevasse splay, and distributary sand, and flood-basin mud deposits, about 60 m thick, (2) fine-grained channel facies (alluvial sand, silt, and clay) about 10-25 m thick, thicker seward, and (3) fine-grained overbank facies (alluvial silt and clay) about 55-65 m thick, thicker seaward. Together, these deposits form a deltaic plain that parallels the Gulf Coast. Unit contains Pleistocene vertebrate fauna, dips seaward beneath the Beaumont Fm. and disconformably overlies deposits of the Pliocene and early Pleistocene Willis Formation. The deltaic plain is entrenched as much as 7 m by streams. In Hidalgo County (southernmost part of Texas) the unit underlies a semiarid plain, widely irrigated and cultivated. Unit is locally veneered with thin, discontinuous stabilized eolian sand.

Species Lists


This diagram is a preliminary phylogenetic tree based on two sequences for this specimen and related records at GENBANK. The circled branch is where this specimen fits in the tree.

Proposed Names

27% (1)
Used references: Gilled mushroom key at
54% (1)
Recognized by sight
81% (1)
Based on chemical features: Two separate Barcode sequences

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= Observer’s choice
= Current consensus


Add Comment
Could you add the sequence data?
By: Alan Rockefeller (Alan Rockefeller)
2020-04-16 23:04:52 CEST (+0200) is the link to add a sequence to this observation.

I have changed the name based on preliminary sequencing data to Fungi.
By: Robert Benson (RobertBenson)
2020-04-16 22:38:05 CEST (+0200)

Got back the sequence of this specimen recently, and based on comparisons at Genbank, it does not belong to the genus Agrocybe. The closest match was in the range of 87%. The trace looked good, so I’m not sure why the match was so low. I’m looking into possible reasons. For now, I’ll just call it a fungus.

Created: 2020-02-22 14:53:06 CET (+0100)
Last modified: 2020-09-01 20:49:02 CEST (+0200)
Viewed: 85 times, last viewed: 2020-09-09 14:43:01 CEST (+0200)
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