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Didn’t think to look under his C. furcata page. :) I’ll have to pay closer attention next time I’m in eastern North America. C. furcata is one of our most abundant Cladonia in the southern Appalachians, displaying a bewildering range of variation. Never know: maybe part of that variation is another species! :)
the Alan Silverside page for Cladonia furcata gives a partial answer to your question. There are some technical arguments, but he ends saying: “The two species often grow in close proximity on dunes, when the differences become readily apparent”.
Problem: often we have only one specimen potentially belonging to one of these species.
Solution: Find the other! (joke).
from the short descriptions in the references the main difference is in the angle of bifurcation, wide in _C. rangiformis" and shorter in C. furcata. The habitats are also of different type. The chemistry can be similar, being C. furcata more variable in the K reaction. I don’t know further details, but the first one I pointed gives to the specimens a very different appearence.
But that describes forms of furcata, too! :)
I see rangiformis occurs in Newfoundland. Maybe it’ll be included in the Hinds & Hinds New England flora. If so, they’re always good about comparing similar species.
According to Alan Silverside, a special feature of this species is “Podetia … commonly terminating in spiky tufts with pointed, dark apices, surface of podetia appearing speckled, with groups of green algal cells on a paler background”.
I don’t think that the specimen in the other observation is similar to this one. In addition it was found in a completely different habitat.
Created: 2011-09-08 15:18:21 CDT (-0500)
Last modified: 2011-09-08 15:18:22 CDT (-0500)
Viewed: 62 times, last viewed: 2017-06-09 21:04:38 CDT (-0500)