Observation 111302: Bacidia schweinitzii (Fr. ex E. Michener) A. Schneider

When: 2012-08-07

Collection location: Maribel Caves County Park, Wisconsin, USA [Click for map]

Who: Andrew Khitsun (Andrew)

Specimen available

Proposed Names

31% (2)
Recognized by sight
78% (2)
Eye3 Eyes3
Recognized by sight: granular green crust with black apothecia, aggressive growth habit
Based on microscopic features: dark hypothecium

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Jim Bennett returned ID Bacidia schweinitzii
By: Andrew Khitsun (Andrew)
2014-06-30 21:48:37 PDT (-0700)
Hue’s not so important
By: Jason Hollinger (jason)
2012-09-27 23:41:22 PDT (-0700)

That sounds like Bacidia schweinitzii. In the end, I think, there really just aren’t that many woodland crusts that will cover such large areas so aggressively.

I disected the apothecia
By: Andrew Khitsun (Andrew)
2012-09-27 19:00:21 PDT (-0700)

It resembled a marcipan – it had white layer on top, and the bottom had some darkish-brownish color (I can’t detect hues well, being partially color-blind).

I would guess Bacidia schweinitzii
By: Jason Hollinger (jason)
2012-09-26 18:35:31 PDT (-0700)

You should be able to help verify just by sectioning the apothecia, I think. B. schweinitzii has distinctive dark red-brown hypothecium, even visible under dissecting scope if you slice the apothecium cleanly in two vertically. It should look white inside and red-brown at the base. Look for black “peppering” of spores while you’re at it — that would indicate Buellia of some sort.

Two observations in one
By: Andrew Khitsun (Andrew)
2012-09-26 17:58:43 PDT (-0700)

First four photos are on White Cedar. And the second four are on American Beech. But I feel it’s the same species (or just similar?) – they were only couple hundred feet apart.

Created: 2012-09-26 17:48:56 PDT (-0700)
Last modified: 2015-12-18 20:27:59 PST (-0800)
Viewed: 66 times, last viewed: 2017-06-14 01:41:23 PDT (-0700)
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