Observation 18282: Lobaria quercizans Michaux
When: 2009-02-07
Herbarium specimen reported

Notes: Location: 35°13’2.20"N, 85°55’18.04"W, el. 544 m. Running Knob Hollow.

Substrate: Growing on inclined and nearly vertical surfaces of sandstone boulders.

Habitat: Along the Perimeter Trail, below the prominent rocky bluffs of the western escarpment of the Cumberland Plateau. Tall, rich eastern deciduous forest with Liriodendron, numerous oaks, hickory, buckeye, maple, etc.

Photos:

Running Knob Hollow, 07 feb 2009: 36095-36110, 36114, 37175-37180
Running Knob Hollow, 14 feb 2009: 36365-36377

This remarkable lichen quickly and dramatically changes color when it gets wet, from a pale silvery gray when dry to bright green when wet. The color change from dry to wet takes only about 10-15 sec. As the thallus dries out again over the ensuing minutes, it changes back to light gray. See photos 36096 and 36097.

The nature of the raised bumps is still undetermined: pycnidia or cephalodia ??

Note added on 08 Mar 2009: A photo of a section thru a pycnidium would be interesting.

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

Voucher specimen: Tennessee, Franklin County, Sewanee, Shake Rag Hollow, 30 Mar 2009, Chris Parrish 0033, det. Gary Perlmutter (NCU)

Common name: smooth lungwort

Species Lists

Images

36095
36096
36097
36098
36099
36110
36114
36365
apothecia, 7.1x
36366
apothecia, 10x
36367
apothecia, 20x
36368
apothecia, 40x
36369
apothecia, 32x
36370
raised bumps, 12.5x
36371
raised bumps, 16x
36372
raised bump, 40x
36373
raised bump, 40x
36374
raised bump, 50x
36375
raised bump, 50x
36376
underside, 7.1x
36377
rhizines, 12.5x
37175
cephalodia (raised bumps) and embedded pycnidia (blackish dots) ???, 20x
37176
cephalodia (raised bumps) and embedded pycnidia (blackish dots) ???, 32x
37177
cephalodia (raised bumps) and embedded pycnidia (blackish dots) ???, 80x
37178
tomentum visible to the left of the amber rhizines, 7.1x
37179
tomentum visible to the left of the amber rhizines, 16x
37180
medulla K+ orange (left), C- (right), 12.5x

Proposed Names

28% (1)
Eye3
Recognized by sight
56% (1)
Eye3 Eyes3
Used references: Brodo, Sharnoff, and Sharnoff, p.420.

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

Add Comment
raised bumps
By: Gary Perlmutter (gbperlmutter)
2009-03-06 09:39:45 CST (+0800)

the raised bumps look like pycnidia, asexual organs that produce asexual spores or conidia

Created: 2009-02-13 06:19:55 CST (+0800)
Last modified: 2009-02-13 06:19:55 CST (+0800)
Viewed: 483 times, last viewed: 2016-11-27 21:13:31 CST (+0800)