I I 



5. Rhipilia. (p. 53). 



Plant uncalcified, green, cuneato-flabellate to excentrically subinfundibuliform, stipitate. 

 Stipes thin. Frond thick or very thin, sometimes zonate, varying in outline, composed of a lax 

 felt-work of dichotomously branched filaments, often not cylindric, bearing rather short pseudo- 

 lateral branchlets terminated by a 2 — 6-fid tenaculum or crown, applied or free. 



6. Cladocephalus. (p. 57). 



Plant uncalcified. green or brown, of varied habit, scopulaeform, flabellate or excentrically 

 subinfundibuliform, stipitate. Stipes thin. Frond or scopula composed of subparallel medullary 

 filaments radiating from the stipes to the periphery, dividing dichotomously without constrictions. 

 Pseudo-lateral branches thinner, tapering, densely and dichotomously subdivided at apex and 

 forming a labyrinthine cortex. 



7. Rhipidodesmis. (p. 62). 



Plant uncalcified, green, filamentous, gregarious, laxly caespitose; filaments decumbent 

 below, ascending above and complanato-fastigiate at apex; constrictions symmetrie above each 

 dichotomy. Upper dichotomies approximated. 



8. Callipsygma. (p. 63). 



Plant uncalcified, green, complanate. Stem flat, sparingly branched, plumosely fringed all 

 along its edge with numerous subparallel patent green filaments. Filaments dichotomously divided 

 above into narrovv monostromatic flabellules. Supra-dichotomial constrictions even. 



9. Boodleopsis. (p. 64). 



Plant uncalcified, minute, forming small green felted cushions, consisting of an incon- 

 spicuous monosiphonous tapering axis, bearing branches repeatedly divided di- and trichotomously 

 and divaricately at short intervals, and laxly intricated. Constrictions even. 



II. Udoteae. 



10. Tydemania. (p. 65). 



Plant thinly calcified, dimorphic, consisting of a conspicuously cylindrical monosiphonous 

 axis, either creeping and bearing numerous terminal flabella, or ascending and bearing verticils 

 of ramifying branches vvhich become interwoven into glomeruli. Constrictions even. 



11. Penicillus. (p. 68). 



Plant calcified, consisting of stipes and capitulum. Stipes compound, encrusted, not 

 reaching apex of capitulum, consisting of a dense brush-like tuft of ascending free filaments 

 dichotomously divided but not in one plane, evenly constricted above each dichotomy. 



