Observation 60226: Pertusaria paratuberculifera Dibben

When: 2010-11-07

Collection location: Dabney Creek, Madison Co., Arkansas, USA [Click for map]

Who: Jason Hollinger (jason)

Specimen available

on bark of hickory in bright open young forest on small ridge


UV+y cortex (and UV+ ice-blue showing through cracks in thallus)
wart sliced open, showing UV+y on cortex and UV+ ice-blue in medulla
spores in asci in water at 400x
spore in water at 400x

Proposed Names

87% (1)
Eye3 Eyes3
Used references: Ozark Keys, Harris & Ladd 2005.
Lichens of North America, Brodo et al. 2001.
Based on microscopic features: 2-4 spores per ascus
Based on chemical features: K-, C-, KC- everywhere; UV+y cortex, UV+ice-blue medulla

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
two very similar species
By: Chris Parrish (kitparrish)
2011-01-02 00:54:09 CST (-0500)

Pertusaria paratuberculifera is superficially identical to the rarer P. valliculata, which has four spores per ascus compared to the 8 spores per ascus of P. paratuberculifera” (Harris and Ladd, 2005, p.162). Also, the ascospores of P. valliculata are ornamented, while those of P. paratuberculifera are smooth. “In the field this species [P. valliculata] is usually indistinguishable from the more common P. paratuberculifera, and must be examined microscopically to confirm the fewer, ornamented ascospores” (Harris and Ladd, p. 195).They also mention that P. valliculata is most common on Carya and Quercus, so that fits as well.

Created: 2010-12-04 12:17:37 CST (-0500)
Last modified: 2010-12-04 12:17:41 CST (-0500)
Viewed: 34 times, last viewed: 2017-08-12 11:07:58 CDT (-0400)
Show Log