Observation 202786: Pyrenula chlorospila (Nyl.) Arnold
When: 2015-04-03
Who: zaca
No herbarium specimen

Notes: Growing on a smooth barked tree.

At this location there were many specimens of Pyrenula similar to those in observation 202253 and observation 202255. All have the same appearance, except for the size of perithecia. But, at a particular tree, several specimens like those in the attached photos grew. The thallus is completely different from the others, dark grey with a shade of blue, and at first I saw no apothecia or perithecia on it. After looking at the thumbnail photo I then saw three or four perithecia (I repeat the photo with the perithecia marked). Fortunately I collected that specimen and the microscopy revealed spores very similar to the others in the observations cited above. I was not able to find anything similar either in my lichen books or in the internet. What species will be?

(21.2) 21.9 – 27.8 (28.9) x (8.3) 8.7 – 10.8 (11.2) µm
Q = (2.1) 2.2 – 2.9 (3.1) ; N = 30
Me = 25 × 9.7 µm ; Qe = 2.6


Same photo with perithecia marked;
Other specimen at the same tree;
Microscopy: Section, asci and spores;
Microscopy: Asci and spores;

Proposed Names

58% (1)
Recognized by sight
87% (1)
Eye3 Eyes3
Recognized by sight: ID provided by André Aptroot.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Yes, I do.
By: zaca
2015-04-14 17:27:10 MDT (-0600)

I have tried and faced the same problem as you.

Do you have Aptroot 2012?
By: Jason Hollinger (jason)
2015-04-14 17:24:07 MDT (-0600)

He presents a world key to all the species of Pyrenula and Anthrocothecium. Published in the Lichenologist (BLS). I can send you a copy if you need it. I tried to key yours out, but there are too many couplets I can’t answer!

Created: 2015-04-14 16:04:20 MDT (-0600)
Last modified: 2016-05-21 14:19:59 MDT (-0600)
Viewed: 47 times, last viewed: 2017-06-20 00:17:54 MDT (-0600)
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