Eu-Floridefe, Polysiphoniese. Polysiphonia. 939 



algen p. 243, Hutchinsia Brodiaii Schousb. in J. Ag. Till Alg. 

 Syst. VII, p. 102 partim (fide Bornet) (non Conferva clenudata 

 Dillw., quoe siphones pericentrales 6 possidet et ad Polysiphoniam 

 variegatam pertinet), Hutchinsia atro-rubescens Ag. Syst. p. 154, 

 Sp. Alg. II, p. (34 (non Syn.), Conferva nigra Huds. Engl. Bot. 

 tab. 2340, Dillw. Syn. n. 162, Conferva badia Dillw. Syn. n. 161, 

 tab. G, Polysiphonia badia Grev. Harv. in Hook. Br. Fl. p. 331 

 (non aliorum), Ceramium Hutchinsiw Mert. mscr., Hutchinsia 

 discolor Ag. Syst. pag. 153, Sp. II, pag. 80, Polysiphonia disco- 

 lor Kuetz. Sp. pag. 825, Polysiphonia squarrosa Kuetz. Sp. 

 pag. 822, Tab. Phyc. XIII, t. 86, f. e-c (suadente loco natali), J. 

 Ag. Sp. II, 3, p. 1069, Ceramium Deschampsii Bonnem. mscr., 

 Hutchinsia Deschampsii Ag. Syst. pag. 156, Grammita spirata 

 Bonnem. Hydr. loc. p. 30, Grammita badia Bonnem. 1. c. p. 35, 

 Polysiphonia Agardhiana Grev. Scot. Cr. Fl. tab. 210, Harv. in 

 Hook. Br. fl. II, p. 331, Kuetz. Sp. Alg. p. 811. Tab. Phyc. XIII, 

 t. 49, f. d-f (propagulifera), Conferva atro-rubescens Dillw. Brit. 

 Conf. tab. 70. — Caespite erectiusculo, elongato, filis a basi arti- 

 culatis ecorticatis, decomposito-dichotomis ramulisque utrinque at- 

 tenuatis lateralibus virgatis, tetrasporangiferis in ramos laterales 

 densius subpinnatim ramosos fasciculatos abeuntibus, siphonibus 

 8-14, articulis inferioribus diametro 3-6-plo longioribus, ramulo- 

 rum circiter aequalibus; tetrasporangiis in ramulis fusiformibus 

 seriatis; cystocarpiis subglobosis, brevissime pedicellatis. 



Hab. in oceano Atlantico ab oris Scandinavise usque ad Tin- 

 gin Africse et Olyssiponam Lusitaniae; ad oras Americse (sec. 

 Harvey); in mari Australi ad Insulas «Falkland» et Caput Bonse 

 Spei (sec. Harvet). — A plexu radicali, frondes plurimas con- 

 jungente, caespes ad modum P. arceolatce adscendit 6-15 cm. lon- 

 gus, aliquando immo major. Fila inferne setam vix crassa, sur- 

 sum non admodum attenuata, deliquescenti-dichotoma (caulem ita 

 proprium nullum formantia), ramis conformibus at brevioribus ra- 

 mulisque lateralibus plus minus dense virgata. Ramuli utrinque 

 evidenter attenuati, nunc, in planta juvenili aut demum cysto- 

 carpifera, pauciores et simpliciusculi, nunc in planta adultiori et 

 demum tetrasporifera densiores et decompositi fasciculati, ramel- 

 lis subpinnatim dispositis. Articuli nunc breviores, in filis prima- 

 riis diametro sesquilongiores, nunc elongati 4-plo, immo fere 6-plo 

 longiores; in ramis mox breviores evadunt, infimi et ramulorum 

 juvenilium diametro breviores. Siphones in adultiore parte plus 



