Observation 33631: Punctelia caseana Lendemer & Hodkinson

When: 2010-02-07

Collection location: Sewanee, Franklin Co., Tennessee, USA [Click for map]

Who: Chris Parrish (kitparrish)

Specimen available

Locality: 35°12’47.92"N, 85°55’20.20"W, el. 586 m. Woodlands.

Substrate and habitat: Growing on a branch of scarlet oak, Quercus coccinea, brought to the ground by recent rain storms, in a park-like residential area bordering oak-dominated eastern deciduous woodland at the western rim of the Cumberland Plateau.

cortex: C-, K-, KC-, Pd-
medulla: C+ flash of red, K-, KC+ red to orange quickly, Pd-
soredia: Pd+ pale yellowish slowly

Identification: A Punctelia with round laminal soralia and pale lower cortex will key out immediately to Punctelia subrudecta in Brodo (2001, p.606), but taxonomists have been at work on this group, and there have been several changes. Aptroot (2003) pointed out that North American material differs at the species level from the European Punctelia subrudecta (as seen, for instance, in amadej’s fine MO observation #18596), and most of the collections from eastern North America were then referred to Punctelia perreticulata instead. More recently, Lendemer and Hodkinson (2010, in review) carry the analysis further and propose a new species to accommodate this material. MO follows the most recent Esslinger checklist for lichens of North America, so the present observation is assigned to Punctelia perreticulata, at least until the NA checklist picks up its new name, Punctelia caseana.

Sharnoff’s Punctelia caseana gallery
CNALH images and locality map, and a larger, interactive locality map.
Lendemer and Hodkinson. In review. A new perspective on Punctelia subrudecta in North America: Previously-rejected morphological characters corroborate molecular phylogenetic evidence and provide insight into an old problem. Lichenologist. [cited in Hodkinson, B. P., R. C. Harris, and M. A. Case. 2009. A Checklist of Virginia Lichens. Evansia 26(2):64-88.] The paper by Lendemer and Hodkinson includes a key to all North American Punctelia species, as presently understood.
Aptroot. 2003. A new perspective on the sorediate Punctelia (Parmeliaceae) species of North America. The Bryologist 106(2): 317-319.

Voucher specimen:
United States, Tennessee, Franklin County, Sewanee, Woodlands. 07 Feb 2010. Chris Parrish 0049, det. James C. Lendemer (NY).

Note added on 22 March 2010: James C. Lendemer has identified the associated specimen as Punctelia caseana. As mentioned above, the description of this new species by Lendemer and Hodkinson is in the process of being published. When that name is published, Punctelia perreticulata will refer to a different species, so it seems best to attach the name Punctelia caseana to these photos.

Common name: forest speckleback

Species Lists


laminal soralia, 32x
laminal soralia, 40x
marginal soralia, 32x
marginal soralia, 40x
whitish lower cortex, 25x
forked rhizines, 63x
forked rhizines, 80x

Proposed Names

28% (1)
Used references: Brodo, Sharnoff, and Sharnoff, 2001, pp.605-610; Harris and Ladd, 2005, pp.203-204; Lendemer and Hodkinson, in review, 2010, pp.1-23
85% (1)
Eye3 Eyes3
Used references: Specimen identified by James C. Lendemer (NY)

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2010-02-15 17:13:36 CST (-0600)
Last modified: 2010-02-15 17:13:36 CST (-0600)
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