OF SOUTH AUSTRALIA. 
197 
Kylin after a study of the type specimens 
of both, concludes that H. subulosa J. Ag. is 
not separable from H. filiformis. 
2. Very decompound, sub-corymbose, pinnate 
below, dichotomous above, terete but not fili- 
form; the ultimate ramuli secund, acuminate, 
like deer horns H. ceratoclada 
South Australia (Encounter Bay), Victoria. - 
Section B. 
Frond compressed flat, pinnately decompound. Cystocarps scattered over 
and projecting from the plane face of the frond. 
1. Frond dichotomo-pinnate, rachis and branches 
broadly linear, narrowed at base. Rachis to 12 
mm. but usually 6 mm. to 8 mm. Branches 
ligulate, closely pectinated with patent, simple 
or pinnulate ramuli ILusnea (R. Br.) 
J. Ag. 
Fig. 63. — Hymenocladia usnea: a, plant; b, section of 
a conceptacle; c, spores from the same; 
d, cross-section of a frond, with imbedded 
tetraspores; e, a tetraspore. (After 
Harvey.) 
