Observation 34793: Parmelinopsis minarum (Vainio) Elix & Hale

When: 2010-03-13

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 and habitat: Growing on the boles of forest trees within a few m of the ground, in oak-hickory woodland on the western rim of the Cumberland Plateau.

Chemistry:
cortex: C-, K-, KC-, Pd- [K+ pale yellow expected]
medulla: C+ pinkish red (immediately, then fading and disappearing in a few sec), K-, KC+ reddish (immediately, then fading and disappearing in a few sec), Pd+ pale buffy yellow (slowly)

Identification: Densely isidiate, corticolous shield lichen of modest size, with sparse axillary cilia and black lower cortex, lightening to brown under marginal lobes. The medulla is C+ pinkish red, KC+ reddish, but both reactions are fleeting. The curvy outlines of the outer lobes and densely isidiate center of the shield are distinctive. Similar species include Parmelinopsis horrescens (isidia with cilia, medulla C-) and Myelochroa obsessa (saxicolous; medulla white, yellowish, or orange; medulla K+ yellow, Pd+ orange) (Hinds and Hinds, 2005, pp.325 and 342—343).

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

Voucher specimen:
United States, Tennessee, Franklin County, Sewanee, Beckwith’s Point Trail. 13 Mar 2010. Chris Parrish 0077, det. James C. Lendemer (NY).

Common name: hairless-spined narrow-shield. Parmelinopsis minarum is so named to contrast with Parmelinopsis horrescens, which is called the hairy-spined narrow-shield. However, as far as names go, narrow-shield is weak, hairless-spined dubious, and someone missed a bet in not leveraging off of horrescens in some graphic way (e.g., horrific narrow-shield).

Species Lists

Images

thallus, 10x
thallus, 12.5x
isidiate surface, 7.1x
isidiate surface, 10x
isidiate surface, 12.5x
isidia, 20x
isidia, 40x
isidia, 40x
isidia, 63x
axillary black cilia, 50x
axillary black cilia, 80x
axillary cilia, 50x
marginal cilia, 63x
apothecial rim, 32x
apothecial rim, 32x
apothecial rim, 40x
apothecial rim, 40x
lower cortex, 63x
lower cortex, 115x
black lower cortex, 100x
black lower cortex, 110x

Proposed Names

85% (1)
Used references: Hinds and Hinds, 2005, pp.342—344

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= Observer’s choice
= Current consensus

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Created: 2010-03-14 09:11:09 CET (+0100)
Last modified: 2010-06-09 09:04:10 CEST (+0200)
Viewed: 249 times, last viewed: 2019-02-02 12:54:28 CET (+0100)
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