Observation 18093: Collema pulcellum Ach.
When: 2009-02-07
No herbarium specimen

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

Habitat: 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.

Substrate: Growing with numerous mosses and other lichens on a damp sandstone boulder beside the trail. Quite inconspicuous on the rock, in small clumps a few cm across, black, crumpled, hunkered down and striving for insignificance. Thallus is totally soft and flexible, like wet lettuce.

Chemistry: C-, K-.

Photos:
Running Knob Hollow, 2009-02-07: 35733-35739
Running Knob Hollow, 2009-03-30: 42139-42150

Common name: blistered jelly lichen

Note added 06 Mar 2009: Remarkable, isn’t it, amanitarita. I was standing next to it for some time before I even noticed it on the boulders.

We are going to be making voucher specimens for many of these lichen photos now, and this one will be a good candidate to send over to the UNC Herbarium for a more careful identification. Thanks, Gary!

Note added 07 Mar 2009: Jason, good idea. WIll do that when I collect it to send to UNC. These are definitely wet … I squirted them!

Here are photos from British Lichens comparing Leptogium and Collema.

Notes added 27 Apr 2009:
Identification: Specimens of this lichen were determined by Gary Perlmutter at the UNC Herbarium to represent Collema pulcellum. Brodo (2001, p.286) characterizes this species as “common on the bark of poplars and other trees,” but in the Ozarks, two forms of this species were found on “shaded, mossy limestone” and “mossy sandstone” respectively (Harris and Ladd, 2005).

The lichens in these photos occurred in little patches with mosses and Lobaria quercizans over about 2 or 3 sq. meters of a large sandstone boulder which had fallen downslope from the cliffs above. See MO Observation 20653 for what seems to be the same species growing nearby on tree bark.

Species Lists

Images

35733
thallus, 10x
35734
thallus, 10x
35735
apothecia, 10x
35736
apothecia, 10x
35737
apothecia, 10x
35738
apothecia, 10x
35739
x-section of apothecium, 100x
42139
dry, Running Knob Hollow, 2009-03-30
42140
dry, Running Knob Hollow, 2009-03-30
42141
dry, Running Knob Hollow, 2009-03-30
42142
dry, Running Knob Hollow, 2009-03-30
42143
dry, Running Knob Hollow, 2009-03-30
42144
dry, Running Knob Hollow, 2009-03-30
42145
moist, Running Knob Hollow, 2009-03-30
42146
moist, Running Knob Hollow, 2009-03-30
42147
moist, Running Knob Hollow, 2009-03-30
42148
moist, Running Knob Hollow, 2009-03-30
42149
moist, Running Knob Hollow, 2009-03-30
42150
moist but drying, Running Knob Hollow, 2009-03-30

Proposed Names

28% (1)
Eye3
Used references: Brodo, Sharnoff, and Sharnoff, p.405
56% (1)
Eye3 Eyes3
Recognized by sight: Specimens of this lichen were determined by Gary Perlmutter at the UNC Herbarium to represent Collema pulcellum.

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

Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

Add Comment
Add photos of dry specimen, too!
By: Jason Hollinger (jason)
2009-03-07 10:57:21 CST (-0500)

These look so different when wet, it’d be really cool if you could take photos both dry and wet (and label them!) I’ve collected “new” lichens dozens of times only to find that they had mysteriously “disappeared” when I got home… because they’d dried in transit and looked totally different when dry!

wow. i almost didn’t believe that it was a lichen til I saw the apothecia.
By: Debbie Viess (amanitarita)
2009-03-06 00:57:50 CST (-0500)
Collema
By: Gary Perlmutter (gbperlmutter)
2009-03-05 20:33:34 CST (-0500)

Looks like a Collema to me.

Created: 2009-02-08 03:33:14 CST (-0500)
Last modified: 2010-04-10 09:52:19 CDT (-0400)
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