Eu-Floridese, Polysiphonieae, Bryothamnion. 975 



2. Bryothamnion Seaforthii (Turn.) Kuetz. Phyc. gen. p. 433, tab. 52, 1632 

 fig. II, Sp. p. 842, J. Ag. Sp. II, 3, pag. 848, Falkenb. Rhodom. 

 (1901) pag. 174, t. 19, f. 34 (organ. mascul.), Fucus Seaforthii 

 Turn. Hist. Fucor. tab. 190, Thamnophora? Seaforthii Ag. Sp. 

 p. 227, Syst. p. 240, Mout. Cuba p. 59, Pl. V, ftg. 1 a-e, Aman- 

 sia? Seaforthii Grev. Syn. p. XLVI, Aug. St. Hil. Voy. 11, p. 436, 

 Sphatrococcus triangidaris var. bifarius Mart. Fl. Bras. 1, p. 36, 

 Alsidiiun Seaforthii J. Ag. in Linnaea XV, p. 28, Bryotliamnion 

 hypnoides Kuetz. Sp. (1849) p. 812 (ex ins. Cuba) ?, J. Ag. Sp. II, 

 3, p. 851, Bryothamnion ramellosum (Sond.) Kuetz. Sp. (1849) 

 p. 842 (ex oris Mexicanis)?, J. Ag. Sp. II, 3, pag. 851, Bryotha- 

 mnion Lindenbergii Kuetz. Phyc. gener. (1843) p. 434, Sp. p. 842 

 (ex Angola Africae [suadentibus diagnosi et synonymis dubie alla- 

 tis], J. Ag. Sp. II, 3, p. 851, Thamnophora disticha Lindenb. fide 

 Kuetzing). — Fronde compressa, decomposito-pinnata subfastigiata, 

 ramis inferne distiche a margine pinnatis, superne conformibus 

 aut pinnis a disco quoque emergentibus plus minus imbricatis, 

 pinnis distiche pinnulatis, pinnulis subulatis rigidis; stichidiis axil- 

 laribus. subsingulis, parce ramosis, mollibus, torulosis. 



Hab. ad oras insul. Indiae occidentalis, Barbadoes, Cubae, Sanctae 

 Crucis, Jamaicae et ad oras Americae a littore Mexicano usque ad 

 Brasiliam; an eadem species in sinu Guineae ad ins. « Rolas » 1 

 (Greeff, Falkenberg). — Frons circiter 8-15 cm. longa, compressa 

 et pinnatim plus minus decomposita. ramis sparsioribus aut ple- 

 rumque superne admodum densis fastigiata. Pinnae nunc subregu- 

 lariter distichae et a submargine rachidis provenientes, nunc et 

 praecipue in superiore parte tum a margine tum a disco uno aut 

 utroque seriebus decurrentibus trifariam aut quadrifariam hic illic 

 dispositne, nunc ita dense circumcirca provenientes ut rachidem 

 omnino obtegentes frondem reddant fere teretiusculam ; utcumque 

 disposita-, sunt singulae iterum pinnatim compositae, pinnulis regu- 

 lariter alternantibus erecto-patentibus, ultiini ordinis subulatis acu- 

 tis aut obtusioribus rigidiusculis polysiphoniis, rachide mox corti- 

 cata. Stichidia in axilla pinnularum pinnatim quoque disposita, 

 pinnulis aeque longa aut paulo breviora. singula aut pauca, sim- 

 plicia aut parce ramosa, supra stipitem brevissimum sterilem fer- 

 tilia, eximie torulosa et mollia, ambitu fere lancoidea, tetrasporan- 

 giis pro ratione magnis at paucis (5-7) circumcirca linea spirali 

 prominulis instructa. Cystocarpia subglobosa, ad apices pinnarum 

 subterminalia. pedicello pinnulato. Antheridia (sec. Falkenberg) ty- 



