Observation 97850: Punctelia hypoleucites (Nyl.) Krog

When: 2012-06-03

Collection location: Madera Canyon, Santa Rita Mountains, Pima Co., Arizona, USA [Click for map]


Who: Ivan Rodriguez (Ivan Rodriguez)

No specimen available

I’m no expert on lichens; I have a faintest clue how to identify them and don’t have a guide to the ones of the area. Any help is welcome.



Proposed Names

26% (2)
Recognized by sight
56% (1)
Used references: Sonoran Flora, Vol. II, 2004 (treatment of Punctelia by Egan and Aptroot)

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Ivan Rodriguez (Ivan Rodriguez)
2012-06-20 21:57:59 CDT (-0400)

There’s so many subtle differences to consider in the identification of lichens… it’s amazing. Thank you for the tip, I’ll investigate on those two candidates and try to figure out which it could be. Thank you!

Two species to consider
By: Jason Hollinger (jason)
2012-06-20 19:43:15 CDT (-0400)

This is definitely Punctelia: note the little white dots scattered sparsely over the surface, especially in the smooth flat areas near the lobe tips; also note the difference in color between this and the much greener Flavopunctelia growing next to it.

There are only two species of Punctelia in that area without soredia or isidia: P. hypoleucites is the more common on bark according to the Sonoran Flora, while P. graminicola (also common in the area) is more common on rock. The primary difference is the length of the conidia: hypoleucites is 10-13µm, graminicola is 4-6µm long. These are the asexual spores found in tiny black dots immersed in the thallus — not the large brown cup-like sexual fruiting structures!

Created: 2012-06-20 17:22:46 CDT (-0400)
Last modified: 2012-06-20 19:38:57 CDT (-0400)
Viewed: 40 times, last viewed: 2017-06-13 04:41:32 CDT (-0400)
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