When: 2009-01-25

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

Who: Chris Parrish (kitparrish)

Specimen available

Notes:
Locations:
35°12’36.32"N, 85°55’53.79"W, el. 574 m, Lake Cheston.
35°12’15.59"N, 85°55’13.48"W, el. 589 m. Central Campus.
35°13’2.86"N, 85°57’36.98"W, el. 545 m. Thumping Dick Cove.
35°12’47.92"N, 85°55’20.20"W, el. 586 m. Woodlands.

Substrate and habitat: One of the most common shield lichens on tree bark in Sewanee’s deciduous hardwood forests and urban areas. Occasionally on rocks.

Chemistry:
cortex C-, K+ yellow (weak), KC-;
medulla C+ red changing to yellow (crimson or cherry red immediately, fading to bright yellow within about 15 sec), K-, KC+ pink (pink, fading to dirty cream)

The shield lichen Flavoparmelia caperata is also abundant on tree trunks at Sewanee. Punctelia rudecta has marginal lobes with abundant pseudocyphellae (showing as white spots), is isidiate, white below, and the medulla is C+ red. Flavoparmelia caperata has smooth marginal lobes, is sorediate, jet black below, or brown below marginal lobes, and the medulla is C-.

Photos:
Lake Cheston, 25 jan 2009: 37309,
Central campus, 01 feb 2009: 37312-37314
Lake Cheston, 05 feb 2009: 37310
Thumping Dick Cove, 21 feb 2009: 37311, 37315-37326
Central campus, 26 feb 2009: 37661
Woodlands, 06 feb 2010: 77372-77376, 77579

References:
Sharnoff’s Punctelia rudecta gallery
CNALH images and locality map, and a larger, interactive locality map.

Voucher specimen: United States, 
Tennessee, Franklin County, Sewanee, Woodlands. 07 Feb 2010. Chris Parrish 0039, det. James C. Lendemer (NY)

Common name: rough speckled shield lichen

Species Lists

Images

on bark of tulip-poplar, Liriodendron tulipifera
on bark of tulip-poplar, Liriodendron tulipifera
on rock
lobes, 7.1x
pseudocyphellae, 40x
pseudocyphellae, 100x
isidia, 10x
isidia, 12.5x
isidia, 20x
isidia, 25x
isidia, 25x
isidia, 25x
isidia, 63x
isidia, 100x
underside of thallus, 10x
rhizines, 63x
rhizines, 80x
rhizines, 80x
with apothecia, on bark of hackberry, Celtis occidentalis
lobes with brownish margins and laminal pseudocyphellae, 16x; growing on twig of scarlet oak, Quercus coccinea
pseudocyphellae, 25x
isidia, 16x
isidia, 50x
pale cream-colored under surface with short, pale gray, unbranched rhizines, 32x
on bark of scarlet oak, Quercus coccinea

Proposed Names

46% (2)
Used references: Brodo, Sharnoff, and Sharnoff, pp. 317

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= Observer’s choice
= Current consensus

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