So I had what I called black beard algae in my 29 that ran 2x23w 6500k cfl's and very little dosing (occasional comprehensive) and this is what I had. I think it was 2 different types.
Does it look like either one of these?
Single Spots with just a couple hairs coming out on anubias (and many of my crypts)
Tuffs .. Mostly on the driftwood. Picked off fairly easily, but always regrew somewhere else.
Along with this I had a little Green Spot Algae on the glass and the plants but I'm ok with that type because it goes away fairly easily with a good scrape and the proper fert dosing.
BTW I never figured out what these were. I don't have a microscope to compare with your notes and I tossed all the plants and driftwood in this tank and bleached the crap out of the sand and the tank.
Does it look like either one of these?
Single Spots with just a couple hairs coming out on anubias (and many of my crypts)

Tuffs .. Mostly on the driftwood. Picked off fairly easily, but always regrew somewhere else.

Along with this I had a little Green Spot Algae on the glass and the plants but I'm ok with that type because it goes away fairly easily with a good scrape and the proper fert dosing.
BTW I never figured out what these were. I don't have a microscope to compare with your notes and I tossed all the plants and driftwood in this tank and bleached the crap out of the sand and the tank.