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It’s worth noting, at least. Thanks!
Oak tree.. and although at one time (maybe about 1 1/2 yr ago) there was an old lady living around there who had goats but there are no more cattle except a few stray around this place… And it is definitely not near any parking lots (it’s deep rural country) but next to a wildlife sanctuary (as yet)..
The black one looks just like Collema subflaccidum, and even if not that species, I would certainly put good money on Collema at least. Notice that it has no rhizines underneath. In fact, if you were to make a thin slice of it and put it under the microscope, you’ll see that it has cyanobacteria instead of green algae, and it has no discernable internal structure; it’s just an undifferentiated mass of hyphae and cyanobacteria, no cortex, medulla, anything. When wet it should swell like a sponge and turn gelatinous.
Note that this genus, Collema, is often a good indicator of basic and/or nutrient enriched substrate (some species are less particular, including unfortunately subflaccidum). It would be worth noting which species of tree this was on, anyway, or look at other trees in this same location. (Were animals kept nearby, for example? Or a parking lot?)
I agree with you on the whitish one; it looks like Phaeophyscia to me, too. The key to this group (the so-called “physcioid” lichens) is that they are small-lobed species, usually not shiny (unlike the larger but otherwise similar “parmelioids”), with rhizines below. There are several genera, including Physcia which is usually white below, and reacts K+y due to atranorin in the upper cortex (generally also giving it a bluish cast); Physconia is K-, black below, nearly always pruinose (has white dust on the upper surface near the tips), and the rhizines, while otherwise black and pointy and straight like Phaeophyscia, also generally have abundant tiny side-branches like a bottle-brush; Phaeophyscia is K-, usually black below, with rhizines like this one, often brownish or darker gray than this.
For species id within Phaeophyscia, note the soredia developing under the lobe tips (visible throughout the bottom half of image 122381). This would probably be called P. adiastola were it in North America.
Created: 2010-11-23 00:01:28 CST (+0800)
Last modified: 2010-11-23 00:01:32 CST (+0800)
Viewed: 67 times, last viewed: 2016-11-15 07:38:41 CST (+0800)