Notes: on driftwood – really thought it was A. radiata, but now have misgivings, e.g. Smith et.al has it as 3-septate and Brodo’s key has it as “spores with 4 equal-sized cells” (they don’t mention variation while these are uniformly 4-septate)
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need to work on this, but any suggestions would be appreciated
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Thanks Jason. I had some old pleated plastic bottles for darkroom chemicals, and will use them for bleach if I can find them.
For whatever it’s worth, my recommendations concerning C reagent:
First, do not dilute it! Stronger is always better for K, C and P, but especially C. I’ve never had a false reaction from an overly strong reagent.
Second, the reason C goes bad so quickly is that bleach out-gases chlorine. I find that it helps immensely to keep your reagent bottle full to the top, and replace the cap immediately. I can now keep C for months without changing it. Granted, it lasts longer the less you use it — i.e., the less often you open and close the bottle.
I really appreciate expert assistance! Didn’t get a reaction with C, however my C reagent now only gives a mild red with Parmotrema tinctorum. Guess I’ll get another gallon of bleach, do the test again and report back.
Don’t know why my C goes bad so soon. I’ve tried different brands, keep it in the dark etc. I use about 1cc per gallon.
Looks like the Arthonia pruinata group. It should be C+ jaw-dropping red. There’s interesting variation in A. pruinata and relatives that suggests either additional taxa, or just, well, variation. There might be two distinct chemotypes around Deception Pass (I studied this at Redondo Beach nearby), and these may have different spore sizes. The degree of pruinosity seems to vary among thalli that are otherwise identical, or even among apothecia on the same thallus.
It is indeed beautiful! I wasn’t happy with my own photos of this species, but shows a more heavily pruinose form.
Created: 2012-04-27 19:59:41 COT (-0500)
Last modified: 2012-04-27 20:07:28 COT (-0500)
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