Cladonia species usually have a crustose or squamulose primary thallus followed by a secondary fruticose thallus comprised of hollow stalk-like podetia with fruiting bodies at the tips. Please click on the images to see details and larger photographs.
N.B: When testing for K reaction it is best to test the lower portion of the podetia. The apothecia and pycnidia of all the red-fruited Cladonia species give K+ red to purple and the underside of their basal squamules also gives a general K+ reaction.
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Crustose, Placodioid, Leprose
Squamulose
Foliose
Cladonia
Fruticose, Filamentous
Lichenicolous
AB,
C,
DK,
L,
MO,
PQ,
RS,
TZ
AC,
DF,
GL,
MO,
PQ,
RZ