Eu-Floridese, Oallitliamnieae, Seirospora. 1345 



cystocarpia genuina gonim.oblastis ramosis instructa; dcin Schmitz 

 genus eximie scrutatus est, naturam seirosporarum patefaciens. 



1. Seirospora Griffithsiana Harv. Phyc. Brit. tab. 21, Kuetz. Sp. 2115 

 p. 896, Tab. Phyc. XII, tab. 17, f. a-d, Schmitz Die Gatt. Microth. 

 p. 279, Callithamnion seirospermum Griff. in Harv. Man. p. 113, 

 Aresch. Enum. p. 108, J. Ag. Sp. II, p. 42, Epicr. pag. 12, Farl. 

 Mar. Alg. of N. Engl. p. 129, Hauck Meeresalgen p. 85 (excl. var.), 

 fig. 26, Ardiss. Phyc. Medit. I, pag. 71 p. m. p. Callithamnion 

 hormocarpum Holmes in Grevillea 1874, t. II, Poecilothamnion 

 (Miscosporium) stipitatum Xaeg. Beitr. Ceram. (1861) p. 133 (cnm 

 sporangiis transversali septo bipartitis, pedicello 4-2-articulato ful- 

 tis), Phlebothamnion seirospermum Kuetz. Sp. p. 657, Callitha- 

 mnion versicolor (3. seirospermum Harv. in Hook. Journ. I, p. 302, 

 Callithamnion corymbosumt Decne Class. t. 16, fig. 1 (non Ag.), 

 Callithamnion versicolor Draparn. et alior auct. Gallicorum (non 

 C. versicolor Ag\), Poecilothamnion (Miscosporium) seirospermum 

 Naeg. Beitr. Ceram. (1861) p. 132, Ceramium fruticulosum Roth 

 Cat. Bot. III (sec. Crouan). — Fronde erectiuscula, alterne decom- 

 posito-ramosa sursum longe corticata, ramis ramulisque quoquo- 

 versum egredientibus, ramulis in rarno caulescente subpinnatim 

 dispositis, terminalibus dichotomo-fastigiatis erecto-patentihus fasci- 

 culato-corymbosis; sporangiis sparsis, plerumque pedunculatis, 

 quoad divisionis modiim variis; seirosporis in corymbo termina- 

 libus. 



Hah. ad alias Algas et Zosteram epiphytice crescens nec non 

 ad rupes demersas oceani Atlantici ad littora Britanniae (Grif- 

 fiths, Holmes), Galliae (Naegelt, Lebel) et sinus Codani (Are- 

 schoug); ad littora Americae borealis (Harvey, Falow); eadem spe- 

 cies lecta dicitur in mari Adriatico (Hauck) et in mari Ligustico 

 ad « Porto Maurizio », hic sporangifera simul ac normaliter cysto- 

 carpifera (Strafforello, Ardissone); eadem (1) ad fretum Gale- 

 wanum Novai GuineaB (Askenasy). — Frondes a callo radicali so- 

 litarise aut paucas, 2-7 cm. longae, crassitiem setai sequantes, dense 

 corticatae. Ranii subspiraliter alterni, quoquoversum egredientes, 

 plurinii patentes , inferiores longiores , decompositi ramulisque 

 subcorymbosis virgati. Ramuli inferne ramellis pinnatiui dispositis, 

 superne corymbosis dichotomis constantes. Ramelli, in ramulo co- 

 rymboso supremi, demum fertiles evadunt, toti transmutati, seiro- 

 sporas constituentes, intra articulos plurimos inflato-moniliformes, 



