SYNOPSIS OF G EN ERA. 



I. l'i.xr.i il. \kii \i . 



i. Chlorodesmis. (p. 13). 



Plant uncalcified, green, tufted, composed of free filaments distantly dichotomously branched: 

 filaments arising from a densely felted base, with upper dichotomies distant, upper constrictions 

 either all asymmetrie above cach dichotomy, or all symmetrie. 



2. Avrainvillea. (p. 16). 



Plant uncalcified, flabelliform (except in A. Rawsoni), stipitate (rarely subsessile); stipes 

 more or less thick. Rhizome either well developed or scarcely developed. Frond varying in colour 

 and outline, thick or thin, normally entire (digitate in A. Ridleyi), rarely zonate, composed of 

 a more or less intimately interwoven felt-work of dichotomously branched filaments cylindric to 

 moniliform, uut without fibulae or lateral appendages; constrictions present, sometimes strongly 

 marked at dichotomies. Sporangia terminal on filaments exserted from the flabellum. 



3. Rhipiliopsis. (p. 45). 



Plant uncalcified, green, excentrically subinfundibuliform to flabellate, stipitate; stipes 

 thin, short. Frond thin, rarely zonate, composed of a lax felt-work of dichotomously branched 

 filaments. cylindric, here and there attached by a pseudo-conjugation of two short prominences, 

 whicl from neighbouring filaments. 



4. Flabellaria. (p. 



int uncalcified, green, flabellate, stipitate; or forming caespitose tufts of free filaments 



w/v-like stat'- of F. minima. Stipes slender, corticated (except in F. minima'. 



n F. petiolata] corticated, composed of filaments monostromatically arranged, 



radiating from stipes to margin, and emitting lateral branchlets, the 



lly decompound heads of which, interlocked, form a close cortex over the 



composed of filaments entirely free or slightly held together by a 



