980 RiionoMELE^. Pohjsiphonia. 



60. P.' FEEVLACEA (SuJiT mscr.) erectiuscula elongata, filis tetra- 

 gonis a basi articulatis, ad genicula inferiora nodosis seepe 

 radicantibus, decomposito-dichotomis superne virgatis, fru- 

 ctiferis in ramos sublaterales densius dichotomos fastigiato- 

 corjmbosos abeuntibus, articulis 4-siphoneis, omnibus dia- 

 metro brevioribus aut subsequalibus, sphserosporis in corym- 

 bis ramorum extra ramulos distortos unilateraliter promi- 

 nentibus, keramidiis globoso-OA^atis sessilibus. 



P. ferulacea Suhr mscr. (fide spec. autlientic!). 



P. littoralis Harv. mscr. 



P. breviarticulata Harv. Ner. Bor. Amer. p. 36. tah. XVI. B. 

 (excl. syn. omn.)! Acc. of Mar. Bot. of West. Austr. p. 539 et Fl. 

 Tasm. 2i. 299. 



Exsicc. Harv. Alg. Atistr. n:o 185! 



Hab. in rupibus maritimis infra limitem maris atlantici ad 

 oras Mexici {Liebmann!) et Americse septentrionalis (Harvey!), 

 ad insulam Guadeloupe (Duchassaing!); in oceano australi ad lit- 

 tora Novse Hollandiee! nec non ad Insulas Noukahiva (Jardin!) 

 et Sandvich (Hb. Agardh). 



Csespes 3—6 pollicaris, densus, a plexu radicali intricato assurgens. 

 Fila setam porcinam cjassa, inferne plerumque indivisa, sujierne de- 

 composito-dicliotoma, subfastigiata uno dichotomiee ramo sa^pius bre- 

 viori cseterum conformi, axillis omnium acutissimis. In planta fertili 

 rami dichotomiee laterales breviores sunt, densius decompositi fastigiati, 

 ramulis eorum ab inferiore parte incrassata sphserosporifera longe at- 

 tenuatis", in planta sterili ramuli SH?pe adsunt simpliciusculi, sine or- 



dichotomis, superne alterne decompositis attenuatis, ramis paten- 

 tibiis virgatis; articulis infimis brevissimis, ramorum majorum 

 diametro sesquilongioribus, minorum 2-pIo longioribus 4-sipho- 

 neis, dissepimentis pellucidis, keramidiis globosis breviter pedi- 

 cellatis numerosis. 



Hab. in corallibus parasitica ad Key West Americse. 

 Fila a basi discoideo surgentia sparsa, raro quodammodo csr-spi- 

 tosa, unciam alta, inferne subsetacea, mox attenuata, 2 — 3 lineis supra 

 basem divisa et dein bis aut ter furcata, superioribus irregulariter 

 mnltifidis ad tenuitatem byssoideam reductis. Rami omnes patentes 

 in aqua tlabelliformiter expansi. Genicula nbicumqiie pellucida. Ar- 

 ticuli 4-siphonii tetragoni" infimi diametro breviores, ramorum sesqui- 

 duplo longiores, ramulorum brevissimi. Keramidia numerosa, de- 

 presso-globosa, in ramulis sessilia aut breviter pedicellata, sporis re- 

 pleta. Color ochraceo-brunneus obscurior. Sub^stantia mollis llaccida. 

 ChartEe adhseret. 



Species pulchra ab omnibus Americse facile distincta. 



