When: 2012-02-20

Collection location: Hughes Mountain Natural Area, Missouri, USA [Click for map]

Who: Patrick Harvey (pg_harvey)

No specimen available

Species Lists


Proposed Names

-31% (2)
Used references: Found a reference to it growing on Precambrian granite — which this is also.
56% (1)
Recognized by sight: see comments

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= Observer’s choice
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Add Comment
One of the yellow Acarospora
By: Jason Hollinger (jason)
2012-02-21 11:12:53 PST (-0800)

Pleopsidium grows in nice neat rosettes with lobate (“effigurate”) margins. See how this follows cracks? That’s very typical of Acarospora. In the Ozark flora there are four species:

A. heufleriana – contiguous, medulla K+red, pruinose at least around the apothecia
A. tuckerae – medulla C+pink KC+red, pruinose or not
A. novomexicana – contiguous, not pruinose, “forming substantial patch with effigurate margins”
A. chrysops – scattered areoles, not pruinose

Can rule out A. heufleriana because yours has no pruina. A. tuckerae (called A. “rubescens” sp. provis. in Harris & Ladd 2005) is supposedly the most common yellow species in the Ozarks. According to the description in Sonoran Flora, it is “areolate or squamulose, often overall up to 5 cm wide or in meandering single-file lines”.