918 Eu-Florideae, Polysiphoniefe, Polysiphonia. 



crassitiem pcnnae passerinas aequans, sensim sursum attenuata, per 

 totam longitudinem usque in ramulos corticata, superficie reticu- 

 lato-cellulosa. Rami minoribus ramis conformibus obsiti ramulis- 

 que minoribus virgati, quoquoversum egredientes. Ramuli a latiore 

 basi attenuati, inferiores simpliciusculi, superiores plus minus com- 

 positi, juniores molles pinnatim ramellosi, adultiores rigidiores sub- 

 fastigiati, omnes patentes et in senili planta immo subdivaricati. 

 In his ramulis fastigiatis tetrasporangia evolvuntur, in ramellis 

 verrucosis insequaliter hic illic proeminentia, Cystocarpia ad ra- 

 mulos subdivaricato-ramellosos provenientia, pedicello brevissimo 

 suffulta, ramis, quibus innascuntur, duplo crassiora, ovato-globosa. 

 Articuli in tota planta fere nusquam nudi, in superiore planta 

 obscurius distinguendi, diametro fere 2-plo breviores, in ramellis 

 adparenter polysiphonii, at siphones primarii revera 4 circa cen- 

 tralem, qui vero mox subdividuntur totidem exterioribus, ut e se- 

 ctione transversali conspiciatur. Color in planta fibrillis instructa 

 ex griseo nigrescens, alias fusco-purpurascens, exsiccatione nigre- 

 scens. Substantia firma ita ut specimina exsiccando chartie tamen 

 adhgereant. Suadente J. Agardb, a Poljjsiphonia Derbesii haec spe- 

 cies differt ramulis decompositis subfastigiatis ; -a Polysiphonia 

 /lcniculacea quoque articulis brevioribus facilius dignoscitur. 

 69. Polysiphonia Guernisaci (Crouan) J. Ag. Sp. II, 3, pag. 1011, 15S 

 Grammitella Guernisaci Crouan in Ann. Sc. Nat. tom. 10, 1849, 

 p. 373, t. 12 C, Alg. Finist. n. 319. — Fronde decomposito-dichotoma 

 subfastigiata ramulisque intermixtis obsita, usque in ramulos cor- 

 ticata, ramulis patentissimis multo tenuioribus abbreviatis decom- 

 posito-dichotomis fastigiatis, articulis vix conspiciendis diametro 

 brevioribus; tetrasporangiis ramulos fastigiatos verrucoso-distortos 

 occupantibus. 



Hab. in rupibus dernersis oceani Atlantici prope « Brest » Gal- 

 lise (Crouan); an eadem ad Tingin Africae ? (Schousboe). — A ra- 

 dice scutata frons surgit 10-15 cin. longa, crassitiein penme co- 

 lumbinse metiens apicibus tantum attenuatis, deliquescente-iliclio- 

 toma, subfastigiata, nuda aut ramulis minutis obsita. Rami plus 

 niinus distantes et elongati, ssepe incurvi, terminales a basi latiore 

 longe attenuati. Ramuli in planta juvenili nulli, in fructifera prove- 

 nientes, frondi multiplo tenuiores, 2 min. circ^ longi, subverticaliter 

 a fronde exeuntes, dichotomo-decompositi fastigiati, ramellis ere- 

 cto-patentibus a basi latiore attenuatis articulatis, articulis dia- 

 metro brevioribus; tetrasporangia in his verrucoso-distortis evol- 



