Observation 88516: Leptogium cochleatum (Dicks.) P.M. Jørg. & P. James
When: 2012-02-21
Collection location: Sintra, Portugal [Click for map]
Who: zaca
No herbarium specimen

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Eye3 = Observer’s choice
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Dear, Jason, your comments …
By: zaca
2012-03-03 19:44:13 CST (-0500)

are always very wellcome and I learn a lot from them. Please, always give me your opinion and share your doubts.

I should keep my nose out of other countries!
By: Jason Hollinger (jason)
2012-03-03 19:37:33 CST (-0500)

Looking at photos of both on-line, I completely agree with you, both vis-a-vis spores and overall morphology. Despite what the British Flora claims about L. cochleatum, it is very much crinkly, and its apothecia are obviously stipitate. Don’t believe everything you read!

Here are the …
By: zaca
2012-03-03 19:26:44 CST (-0500)

dimensions that I obtained for the spores:
16.6 [21.5 ; 23.8] 28.6 × 11.1 [12.5 ; 13.1] 14.5 µm
Q = 1.4 [1.7 ; 1.8] 2.1 ; N = 26 ; C = 95%
Me = 22.6 × 12.8 µm ; Qe = 1.8.
I think this rules out L. britannicum.
Thanks, Jason, for your comment.

British Flora also suggests L. britannicum
By: Jason Hollinger (jason)
2012-03-03 18:58:40 CST (-0500)

27a. Thallus pale grey, lobes very thin, tissue-like, wavy, crinkled, uneven; apothecia very rare, top-shaped with short, pale stalks . . . L. britannicum
27b. Thallus dark grey, to greenish blue, lobes raher thick, upper surface clearly striate; apothecia frequent, ± sessile . . . L. cochleatum

Yours looks pale, thin, crinkly, not striate, apothecia admittedly common but stipitate not sessile.

[edit: I also note that L. britannicum has narrower spores, 20-30 × 6-7 µm, with at most a single longitudinal septum. L. cochleatum has muriform spores, 25-30 × 14-16 µm.]

Created: 2012-03-03 17:27:08 CST (-0500)
Last modified: 2012-03-03 19:37:42 CST (-0500)
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