Observation 190559: Punctelia graminicola (B. de Lesd.) Egan

When: 2014-06-19

Collection location: Rattlesnake Mound, Wisconsin, USA [Click for map]

Who: Andrew Khitsun (Andrew)

Specimen available


Copyright © 2015 Jason Hollinger (jason)
conidia in water

Proposed Names

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Recognized by sight
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Just checked: medulla is C+r
By: Jason Hollinger (jason)
2015-05-07 19:31:16 PDT (-0700)

I believe that rules out P. bolliana.

Why ever would you baulk at the possibility that you’ve found a species new to Wisconsin?? It wouldn’t be your first, right?

It is also possible that not all taxonomists agree that P. graminicola and P. hypoleucites are distinct species.

Would you like the specimen back so you can send it to Bennett?

Thomson didn’t have it in his list
By: Andrew Khitsun (Andrew)
2015-05-07 19:18:50 PDT (-0700)

Nor does Bennett. So officially it doesn’t exist in WI. Of course I am lost when it comes to things like conidia. How about P.bolliana? Thomson says conidia filiform, 1×5 μm. Of course it doesn’t look like one :(

Measured conidia
By: Jason Hollinger (jason)
2015-01-23 22:41:09 PST (-0800)

~4-6 µm long, way too short for P. hypoleucites. Thompson must not have known about this species, or (more likely) it didn’t exist yet. I wonder if you were picking up on something about its gross morphology that looked wrong to you. I have no intuition whatsoever about the difference between them.

(I didn’t note any parasites when I looked at the specimen. Must just be an unusually well-developed specimen.)

Heavens no
By: Jason Hollinger (jason)
2014-11-30 16:59:25 PST (-0800)

I’ve only seen scraps of this species once or twice before. I expect you to be the expert! I just wanted to hear why you thought it looked wrong. :)

It could definitely be parasitized. Lots of lichenicolous fungi show up as pycnidia or pycnidia-like perithecia scattered about the host thallus. Bad infestations will definitely cause the host thallus to change texture, color, etc.

Medula C+ red, lacking soredia or isidia, lower surface tan.
By: Andrew Khitsun (Andrew)
2014-11-30 16:39:40 PST (-0800)

Using Thomson Lichens of Wisconsin this narrows down to Punctelia hypoleucites easily. But I still find this specimen weird. The outer edges look fine. Next going inwards follows a belt with heavy pycnidia that is slightly different color, like if it was afflicted with something. Further inward, a field of apothecia so thick that it looks more like Xanthoparmelia than Punctelia, and apothecial color is not reddish-brown like it’s “supposed to be”, but almost black. I am sure you’ve seen it all before, but to me it looks weird.

What are the options?
By: Jason Hollinger (jason)
2014-11-30 13:19:27 PST (-0800)

P. graminicola
P. hypoleucites

and maybe

P. bolliana

(but that one should be lobulate, I think?)

This just looks “wrong” for these species?

What a royal mess. Doctor Frankenstein at work again?
By: Andrew Khitsun (Andrew)
2014-11-29 18:26:57 PST (-0800)

Created: 2014-11-29 18:17:08 PST (-0800)
Last modified: 2015-12-16 11:43:23 PST (-0800)
Viewed: 70 times, last viewed: 2017-06-19 08:24:38 PDT (-0700)
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