29 
latis, habin, colore in nigrum vix abeunte, et stichidioram 
morphosi supexiore. 
10. Polysiphonia Grev. (Hatchinsia Ag.) 
Polys. microdendron nov. sp. arboriformis, caule con- 
linuo supra medium parce dichotomo, ‘apice in eorymbum 
ramulornm abeunfe, ramulis fastigiatis articnlatis, artienlis 
diametro aequalibus vel brevieribus multivenosis. 
Hab. in sinu Codano ad oxas Bahuside; rapibns in in- 
fertore limite maris adnata, . 
Radix callus expansus magnus, , Caules "pluxes, hasi 
simplices, prope Medium et supra parce dichotomi,  ramique 
eontinui, Ramuli ramosissimi fastigiati, artienlai. Articali 
diemetro subaequales vel immo dimidio breviores, canalibus 
Pluribus, geniculis obseuris. Stichidia” valgaris formae in 
rammlis snperiorihus, Color recentis dilute. olivacens vel pur- 
Purens ramulique rigidiusonli;s in aqua dulei et aöre eitissi- 
me mutata,: color obsourior. rami mollissimi _ et conglobati 
eyadunt, 
Ipsa dispositione ramoerum praecipue distinguenda. P, 
Brodiaei forsan proxims, licet P. elongatae formam incaufns 
Potissimum judicaret. 
11. Dasya Ag. Frons continua,: fila articulata emittens. 
Stöchidid lanceolato-linearia multiplici serie sphaerospermia 
foventi. Keramidid ovato-urceolata, sporidia pyriformia 
Sontinentia, 
Vix ullum inter Algas geuns characferibus firmioribus 
fundatuin fuit meliusve circumseriptum, ef tamen nullum ad- 
est, quod postea' magis extraneis infestum fuit, nullumque, 
“ enjus magis confusae fuerint species, . Confusionis primam 
dedit ansam celeb, Duby, qui charasteres generi in Sperie: 
bus „Algarum adseriptas carpens, hoyas fruetificationis for« 
was ei ndtribuit; his vero accnratius examinafis apparet, -illas _ 
