Observation 19337: Parmotrema reticulatum (Taylor) M. Choisy

When: 2009-03-08

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

Who: Chris Parrish (kitparrish)

Specimen available

Notes:
Location: 35°12’38.36"N, 85°54’0.40"W, el. 587 m, Beckwith’s Point Trail.

Substrate: Growing with other lichens on the trunk of a dead and leaning but still standing tree (about 10 cm DBH).

Habitat: oak-hickory woodland near the western escarpment of the Cumberland Plateau

Chemistry:
cortex: C-, K+ yellow to dark red to dark reddish brown
medulla: C-, K+ bright yellow immediately → bright red → deep red

Characterization: ruffled lichen with marginal setae and
(1) reticulate macular pattern on thallus surface
(2) small elliptic patches of soredia at tips of narrow marginal lobes
(3) undersurface black in the center, grading to brown under marginal lobes
(4) forked rhizines present

Similar species: Parmotrema margaritatum and reticulata are very similar, and margaritatum may even show a reticulate white macular pattern on the upper surface for which reticulata is better known. They both contain salazinic acid, so presumably their spot tests are similar. The most prominent differentiating characters seem to be the largely rhizine-free marginal areas and discrete soredial patches on narrow marginal lobes of P. margaritatum vs. rhizines occuring up to the thallus margins, rhizines sometimes forked, and coalescing, pillow-like marginal soralia of P. reticulatum (Harris and Ladd, 2005; Brodo et al., 2001).

References:
Sharnoff’s Parmotrema reticulatum gallery
CNALH images, description, and locality map, and a larger, interactive locality map.

Voucher specimen: Tennessee, Franklin County, Sewanee, Beckwith’s Point Trail, 08 Mar 2009, Chris Parrish 0003, det. Gary Perlmutter (NCU)

Common name: cracked ruffle lichen (Listed as Rimelia reticulata in Brodo, et al., pp.642-643.)

Species Lists

Images

thallus, 10x
thallus, 7.1x
marginal setae, 32x
macullae, 40x
marginal soredia, 25x
marginal soredia, 32x
marginal soredia, 32x
marginal soredia, 32x
thallus margin, 32x
undersurface, 50x
undersurface, 20x
undersurface, 20x

Proposed Names

28% (1)
Used references: Harris and Ladd, 2005; Brodo et al., 2001
56% (1)
Used references: Specimen identified at the UNC Herbarium

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= Observer’s choice
= Current consensus

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Created: 2009-03-11 22:04:22 EET (+0200)
Last modified: 2009-03-11 22:04:22 EET (+0200)
Viewed: 394 times, last viewed: 2019-02-05 23:52:02 EET (+0200)