Observation 18783: Punctelia rudecta (Ach.) Krog
When: 2009-01-25
Herbarium specimen reported

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

37309
on bark of tulip-poplar, Liriodendron tulipifera
37310
on bark of tulip-poplar, Liriodendron tulipifera
37311
on rock
37312
lobes, 7.1x
37313
pseudocyphellae, 40x
37314
pseudocyphellae, 100x
37315
isidia, 10x
37316
isidia, 12.5x
37317
isidia, 20x
37318
isidia, 25x
37319
isidia, 25x
37320
isidia, 25x
37321
isidia, 63x
37322
isidia, 100x
37323
underside of thallus, 10x
37324
rhizines, 63x
37325
rhizines, 80x
37326
rhizines, 80x
37661
with apothecia, on bark of hackberry, Celtis occidentalis
77372
lobes with brownish margins and laminal pseudocyphellae, 16x; growing on twig of scarlet oak, Quercus coccinea
77373
pseudocyphellae, 25x
77374
isidia, 16x
77375
isidia, 50x
77376
pale cream-colored under surface with short, pale gray, unbranched rhizines, 32x
77597
on bark of scarlet oak, Quercus coccinea

Proposed Names

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

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2009-02-24 00:15:52 CST (-0500)
Last modified: 2009-02-24 00:15:52 CST (-0500)
Viewed: 659 times, last viewed: 2016-11-25 19:39:07 CST (-0500)
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