942 Eu-Floridese, Polysiphonieae, Polysiphonia. 



decomponuntur, inferiores aut ramulis brevioribus obsiti manent 

 aut saepissime ramulis abruptis, persistente parte inferiore ramu- 

 lorum quasi senticosi; haec est forma vulgaris. Apices ramorum aut 

 rachide supereminente pinnati adparent, aut ramulis inferioribus 

 prolongatis fere corymbosi (P. atropurpurea Moore). In planta 

 sonili (et forsan undis jactata et circumvaga) rami minores plu- 

 rimi etiam superiores abrupti adparent (P. senticosa). In planta 

 maris profundioris tota planta magis protensa evadit et minus 

 conspicue pinnato-ramosa, rami magis dissiti, apices vero pinna- 

 tum adspectum servantes, articuli quoque quam in vulgari forma 

 duplo longiores. Hujus quoque duas formas extremas agnoscere 

 licet, praeeunte J. Agardh, nernpe unam ramis fere a basi ramosis 

 apicibus parce pinnatis (f. protensa J. Ag.), alteram ramis basi 

 longe nudis superne dense fasciculato-ramosis (P. affinis). Articuli 

 medii plerumque diametro sesquilongiores aut fere aequales (in for- 

 ma vulgari) ; nunc (in formis profund. maris) diametro triplo lon- 

 giores; superiores et inferiores sensim breviores, diametro circiter 

 sequales: sectione transversali saepissime siphones 16 conspiciuntur, 

 nunc plures 18-20, nunc pauciores (raro 8), circa centralem ipsis 

 paulo majorem, extus nudi aut (inferiorum articulorum) tenui strato 

 corticali (praecipue ad genicula) cincti. Cystocarpia ovata, plerum- 

 (jue brevi pedicello suffulta. Specimina juvenilia chartae adhaerent, 

 colore magis in purpureum tendente; adultiora inferne nigra, su- 

 perne purpurascentia, chartse adhserentia, senilia nigra, nec chartae 

 adhaerentia. Plures formas distinxit clarus Harvey Xereis bor. 

 Amer. II, p. 49, verisimiliter a statione aut aetate plantae pendentes. 



105. Polysiphonia opaca (Ag.) Zanard. Syn. Alg. Adriat. pag. 63, .1. I5fij 

 Ag. Sp. II, 3, p. 105B, Florid. Morphol. t. 33, fig. 4, Kuctz. Sp. 

 pag. 810, Tab. Phyc. XIII, t. 47, f. a-b, Ardiss. Phyc. Medit. I. 

 p. 287, Hauck Meeresalgen p. 246, Falkenb. Rhodomelaceen (1901) 

 p. 120, t. 21, f. 10-11, Hutchinsia opaca Ag. Syst. p. 148, Sp. II, 

 p. 97, Grammita adscendens Bonnem. Hydroph. loc. p. 43 excl. 

 synon. (fide Crouan; non oinnia specimina P. adscendentis in 

 exsiccatis Crouanianis ad Pol. variegatam ne\'t\nent, nonnulla ven> 

 siphones tantum 4 prsebentia), Hutchinsia ramulosa Ag. Syst. 

 Alg. p. 98, Polysiphonia ramulosa Zanard. Syn. pag. 63 ?, J. Ag. 

 Alg. med. p. 144, Kuetz. Sp. p. 810, Tab. Phyc. XIII, t. 46, f. d-f, 

 Polysiphonia barbata Kuetz. mscr., Polysiphonia tripinnata Kuetz. 

 Tab. Phyc. XIII, t. 48, f. a-b (non Agardh), Polysiphonia sticto- 

 phlo?a Kuetz. Sp. p. 815 (mala descriptio 1 , Tab. Phyc. XIII, t, 61, 



