Ajk. Millar et Jm. Huisman, DICROGLOSSUM CRISPATULUM GEN ET COMB-NOV FROM WESTERN-AUSTRALIA, REPRESENTING A NEW TRIBE WITHIN THE DELESSERIACEAE (RHODOPHYTA), Journal of phycology, 32(1), 1996, pp. 127-137
Dicroglossum gen. nov. (Delesseriaceae, Ceramiales) is a monotypic gen
us based on Delesseria crispatula, a species originally described by H
arvey for plants collected from southwestern Western Australia. Distin
ctive features of the new genus include exogenous indeterminate branch
es; growth by means of a single transversely dividing, apical cell; ab
sence of intercalary divisions In the primary, secondary, and tertiary
cell rows; lateral pericentral cells not transversely divided; not al
l cells of the secondary cell rows producing tertiary cells rows; all
tertiary initials reaching the thallus margin; midrib present but late
ral nerves absent; determinate lateral bladelets arising endogenously;
blades monostromatic, except at the midrib, carpogonial branches rest
ricted to primary cell rows, on both surfaces of unmodified blades; pr
ocarps produced on both blade surfaces, each procarp consisting of a s
upporting cell that bears two four-celled carpogonial branches and one
sterile-cell group of three to four cells; and tetrasporangia borne i
n two layers, separated by a central row of sterile cells. The combina
tion of exogenous indeterminate branching and bicarpogonial procarps i
s considered to warrant the recognition of a new tribe, the Dicrogloss
eae, within the subfamily Delesserioideae.