Commentary
Clavulina rosiramea is recognized in the field by its monopodial
to sparsely branched basidioma with an orangish-brown stipe
contrasting with the pale pink hymenium. These features
along with the micromorphology are consistent with place-
ment of the species in Clavulina. The rbp2 phylogenetic analy-
sis indicated placement of C. rosiramea in a well-supported
subclade with three other Clavulina species, in a broader as-
semblage of neotropical species (Fig 1). The perceived rarity
of C. rosiramea in Guyana’s Dicymbe forests was corroborated
in a long-term D. corymbosa plot study of Henkel et al. (2012),
with basidiomata occurring in only 2.5 % of 630, 100 m2 quad-
rats sampled over 7 y.
Other Clavulina species with pale pink hymenia include
Clavulina puiggarii (Speg.) Corner and Clavulina castaneipes
(G.F. Atkinson) Corner (Corner 1950). These species have ei-
ther a whitish or pale pink stipe whereas C. rosiramea has an
orangish-brown stipe. Another orange-stiped Clavulina spe-
cies known from Guyana, Clavulina kunmudlutsa T.W. Henkel
& Aime, is easily differentiated from C. rosiramea by its much
type locality in the Upper Potaro River Basin of Guyana.