Observation 280672: Ascomycota Caval.-Sm.

When: 2017-05-25

Collection location: Monterey Co., California, USA [Click for map]

35.884°N 120.3452°W 521m [Click for map]

Who: J-Dar

Specimen available

On decorticated wood of an old almond orchard tree.

This looks to be lichenized, with no visible thallus, but algal cells observed at base of ascomata in section.

Asci cylindrical, spores 8 per ascus, large, strongly muriform, becoming brown.
50-60 × 25-35µm

Species Lists


K/I stain

Proposed Names

-29% (2)
Recognized by sight
16% (2)
Recognized by sight

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= Observer’s choice
= Current consensus


Add Comment
Yes, and I see algae in cracks in the wood in the first photo, too
By: Jason Hollinger (jason)
2017-07-02 22:20:42 PDT (-0700)

The thing I’m looking at is that the perithecia seem to be emerging from within the wood, and not superficial. If it’s pushing wood grain apart to emerge, then it’s not part of the superficial community, and therefore we might not be able to use lichen literature to arrive at a name. (At least one exception to this rule, though, is Xylographa.)

It looks like perithecia to me too
By: J-Dar
2017-07-02 22:10:28 PDT (-0700)

Shows you how much I know about Arthoniaceae! Basically nothing. See that algae at the bottom of the ascomata section? But yeah, this is a big unknown at this point.

These look like perithecia to me
By: Jason Hollinger (jason)
2017-07-02 21:59:09 PDT (-0700)

The ascus is definitely not arthonioid, in any case. Also, the muriform Arthonia (Arthopyrenia) have a constriction about the middle of the spore.

I wonder if those algae are truly associated, or just accidentally present?

Anyway, try a peritheciate key and see if you get some better candidates.

Created: 2017-07-02 21:35:12 PDT (-0700)
Last modified: 2017-07-05 15:41:26 PDT (-0700)
Viewed: 35 times, last viewed: 2019-10-07 10:33:04 PDT (-0700)
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