Observation 66059: Inocephalus rhombisporus (Kühner & Boursier) Largent

When: 2011-01-16

Collection location: Los Trancos Preserve, Palo Alto, California, USA [Click for map]

Who: Douglas Smith (douglas)

Specimen available

Found under D. fir, C. bay.

The first micro-shot is of the cap surface at 400x in KOH. The top surface is of nodulose hyphae with intercellular pigments, and obviously a cutis. No incrusted hyphae. No clamp con. obs.

The second micro-shot is of the gill edge at 400x in KOH. The edge is thick with clavate cheilocystidia. No pleurocystidia obs.

The third micro-shot is of spores from the gill at 1000x in KOH. The spores are mostly 4 sided, few 5 sided, angular. The apr. ave. spore size is 10 × 9 um.

This one was weird, really distinctive under the scope, I thought it would be easy to id. It doesn’t id easily in Funga Nordica or Champignons de Suisse. Couldn’t find it in the keys in Largents “Entolomatoid of Western US”, just got lost there. Ended up having to flip through the whole book looking for 4 sided spores. There are not that many of those. And then this one comes up. It turns out I was in the wrong genus for him. The cap turns out to be “appressed fibrilose”, when looked at under a hand lens. And this then separates it from Nolanea… oh, well. But also it turns out this is in the European sources also, except they are expecting the cystidia to be fusoid to fusoid-ventricose. Here they are clavate, so I’m not sure what to make of that.

So, the id looks mostly good, but with some issues…

Species Lists



Proposed Names

85% (3)
Eye3 Eyes3
Recognized by sight
Used references: “Entolomatoid Fungi of Western US”, Largent, p388
Based on microscopic features: As desc. in the text.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2011-04-23 01:22:46 CDT (-0400)
Last modified: 2014-05-24 22:48:39 CDT (-0400)
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