Observation 19734: Ramalina petrina Bowler & Rundel

When: 2009-03-22

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

Who: Chris Parrish (kitparrish)

Specimen available

Notes:
Location: 35°13’21.51"N, 85°57’3.86"W, el. 572 m, Rutledge Point Trail.

Substrate: Growing on dry sandstone rock faces with southern exposure to direct sun and few or no other epiphytes on the rock. In all occurrences found so far the rock has been part of or next to a major sandstone cliff.

Habitat: Oak-dominated eastern deciduous woodland at the western rim of the Cumberland Plateau.

Chemistry:
cortex: C-
soredia: C- or possibly just barely a trace of a C+ dingy reaction
cortex and soredia: K+ yellow immediately
cortex and soredia: KC- still yellow
               to dull yellow in two places very slowly
               to dull brownish yellow
               to gold (over several minutes)

Ramalina petrina is “an uncommon Appalachian chemical variant” of Ramalina intermedia (Brodo, et al., 2001, p.624). It’s cliff-face habitat is extensive in this area, but usually difficult to access. Another small population of similar-looking individuals has been found a few km from the original site.

Voucher specimen: Tennessee, Franklin County, Sewanee, Rutledge Point Trail, 22 Mar 2009, Chris Parrish 0029, det. Gary Perlmutter (NCU)

Common name: rock ramalina

Species Lists

Images

Rutledge Point Trail, 22 Mar 2009
thallus, 7.1x
soredia, 12.5x
soredia, 25x
soredia, 25x
soredia and cortex, 50x
soredia and cortex, 25x
soredia, 20x
soredia, 20x
soredia, 25x
soredia, 40x
soredia, 40x
soredia, 50x
soredia, 50x
thallus, 10x
thallus, 16x
branch, 20x
x-section of branch, 100x
Rutledge Point Trail, 22 Mar 2009
Rutledge Point Trail, 22 Mar 2009
Rutledge Point Trail, 22 Mar 2009
Rutledge Point Trail, 22 Mar 2009

Proposed Names

28% (1)
Used references: Brodo, Sharnoff, Sharnoff, pp.624-625
56% (1)
Used references: Brodo, Sharnoff, Sharnoff, pp.624-625
85% (1)
Recognized by sight: Specimens identified by Gary Perlmutter at the UNC Herbarium as Ramalina petrina
Based on chemical features: medulla PD+ orange-red

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= Observer’s choice
= Current consensus

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Created: 2009-03-23 16:17:06 PDT (-0700)
Last modified: 2009-03-23 16:17:06 PDT (-0700)
Viewed: 134 times, last viewed: 2019-03-24 04:24:49 PDT (-0700)
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