Observation 121683: Hebeloma crustuliniforme (Bull.) Quél.
When: 2012-11-19
Who: Byrain

Notes: Growing on a lawn under pine & some unidentified deciduous ornamental trees, oak was across the street. Radish odor.
This was on the same lawn as the Hebeloma in obs 121889.

Spores verrucose & non-dextrinoid
Spore range = 11 – 14 (15) x 5 – 6 (7) µm
Spore average = 12.45 × 5.95 µ
Q range = 1.83 – 2.4
Average Q = 2.1
20 spores measured.
4-spored basidia observed & clamps present.

Cheilocystidia usually with apex inflated & base not inflated.
Measurements = 42×7, 47×8, 52×8, 57×6, 57×7, 59×7, 59×7, 59×7, 59×7, 59×9, 66×8, 68×7 µ
Cheilocystidia average = 57 × 7.33 µ
Pleurocystidia not observed.

Proposed Names

57% (1)
Recognized by sight
91% (2)
Based on microscopic features: clavate cheilocystidia; spores over 11 μm long and x 5.5- 6 μm wide.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
The cystidia
By: Irene Andersson (irenea)
2012-12-31 04:07:45 CST (-0600)

are perfect for crustuliniforme, and along with all other characters, I’m prepared to call it that. Don’t mind mushroomexpert’s photo, it can belong to another species in this group, just like soo many other obses here at MO.

You have a very good documentation here. The spore shape is fine, spore length a little above average but OK, the gill edge has a good amount of large droplets.

H. crustuliniforme IS a large species (caps 3-4 inches are not unusual), and typical is also the widened stem base. I agree that the cap colour is a bit dark, but it is within the variation.

Size? Colors?
By: Byrain
2012-12-31 01:16:00 CST (-0600)

I thought Hebeloma crustuliniforme should be with lighter colors on the cap and a generally smaller size? I don’t think the cheilocystidia on this species is a very good match for the picture at Mushroom Expert, but maybe that is not very significant…


I was thinking this is something in the H. sinapizans group, but I don’t think it is that species. I waited an extended amount of time for the spores to show a dextrinoid reaction because a smaller/paler Hebeloma species in this same lawn showed a delayed dextrinoid reaction.

Created: 2012-12-31 00:50:04 CST (-0600)
Last modified: 2013-12-06 13:38:39 CST (-0600)
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