1923] SetcheU: Parasitic Florideae, II 395 



more careful study of materials from other localities must be made. 

 Unfortunately I have no material for careful comparison with G. 

 Buffhami Batters. The polyspores are possiblj^ a sufficient character- 

 istic upon which to found a new genus. There are certain peculiarities 

 of vegetative structure, also, tending away from Gonmiophyllum. 



Polycoryne Gardner! sp. nov. 



Frondibus in pulvinulo 2-3 mm. diam. aggregatis, albidis ; ramis 

 e centro communi exiguo solido radiantibus, tetrasporangiiferis usque 

 ad 3 mm. longis nunc apiee nunc medio tumidis, aut oblongis, cysto- 

 carpiferis curtis, usque ad 1 mm. longis, cystocarpiis in parte basali 

 positis apice attenuatis acutisque. 



Parasitic on NitophyUnm Andersonianum J. Ag., Point Cavallo, 

 Marin County, California, October, 1913, N. L. Gardner, No. 2594. 



This species, the second to be referred to the genus Polycoryne, is 

 readily to be distinguished from P. radiata Skottsberg by the basal 

 position of the cystocarp and the proportionally longer acute tip of 

 the cystocarpic branch! et. P. radiata was detected at Maihafen in 

 South Georgia Island in the Antarctic Ocean, para-sitic on a species 

 of Nitrophyllum, probably N. polydactyhim. 



StromatocarpiTS Gardneri sp. nov. 



Frondibus pulvinulos 2.5 mm. diam. formantibus, atropurpureis ; 

 filamentis basalibus et hostem penetrantibus monosiphoneis, dense 

 confertis; filamentis superis liberis polysiphoneis, sparse ramosis, 

 cellulis pericentralibus 4, tetrasporangiis in curtis, leviter tumidis 

 stichidiis, in serie singulari, tripartitis ; antheridiis oblongo-ellipsoideis ; 

 cystocarpiis magnis ; pilis nullis. 



Parasitic on Pterosiphonia Baileyi (Harv.) Falk., near Santa 

 Monica, California, Februarv^ 1912, N. L. Gardner, No. 2475. 



Our plant is much longer than ;S'. parasitica Falk., has less swollen 

 stichidia and antheridia and has the tetrasporangia in a single series 

 in the stichidium. It has something more nearly approachng a solid 

 base than is described for 8. parasitica. 



S. parasitica is cited from Cape Colony, South Africa. 



Plocamiocolax gen. nov. 



Genus Florid earum parasiticum in structura frondis et fructi- 

 ficatione Plocamium arete approximans; frondibus minutis filiform- 

 ibus e centro communi, solido, exiguosissimo radiantibus, albidis. 



