Eu-Florideae, Callithamnieae, Callithamnion. 1311 



carpia lateraliter insidentia (nonnnnqiuun adparenter terminalia), 

 Iiand involucrata, e gonimoblastis duobus (rarius unico) composita. 

 Tetrasporangia cruciatim aut triangule divisa '). 



Conspectus generum. 



CalUihamnion Lyngb. — Tetrasporangia triangule divisa aut sporangia hipartita 

 in quoque articulo singula aut plura. Cellulse vegetativae plurinucleatae. 



Seirospora Plarv. — Tetrasporangia cruciatim (rarius triangule) divisa aut spo- 

 rangia bipartita in quoque articulo solitaria. Cellulse vegetativse uninucleatpe. 



t Ilymenocloninm Batt. — Tetrasporangia cruciatim (?) divisa in filis intercalaria. 

 Cellulae vegetativse plurinucleatse (?). Fila ssepe anastomosantia, decumbentia. 



CALLITHAMNION Lyngb. [1819] Hydr. Dan p. 122, emend. (Etym. 

 calos pulcher et thamnion crespes), Ag. Sp. II, p. 156, J. Ag. 

 Sp. II, p. 5, Epicr. p. 4, Engl. & Prantl Natiirl. Pflanzenfam. (1897) 

 p. 489 (excl. sp. apud omnes), Phtebothamnion Kuetz. [1843' Phyc. 

 gen. p. 370, Sp. (1849) p. 638, Pwcilothamnion Naeg. [1847] 

 Neuer. Algensyst. pag. 198, Ceram. (1861) p. 124, Borythamnion 

 ■ Naeg. [1861] Ceram. pag. 110, Leptothamnion Kuetz. [1849] Sp. 

 p. 896, J. Ag. Sp. II, p. 69, Le-Prevostia Crouan [1835] in Ann. 

 Sc. Nat. 1835, Ceratothamnion J. Ag. [1892] Anal. algol. p. 35, 

 Mertensio^, Ceramii, Conferva? sp. auct. — Frons erecta, filiformis, 

 abunde furcatim aut lateraliter (quoquoversum aut superne distiche) 

 ramosa, nunc evolutione mono- nunc sympodica articulata, monosi- 

 phonia, nuda aut fibris articulatis intra membranam externam a 

 basi ramoruni decurrentibus inferne corticata. Celluke plurinucleat;i\ 

 Cystocarpia ssepe bina axillaria vel ad ramulos sessilia (adparenter 

 terminalia) nuda ramulisve paucis vix mutatis stipata, involucro 

 proprio destituta, intra periderma hyalinum carposporas plurimas 

 angulatas foventia. Gonimoblasti duo geminati (rarius unicus) in 

 gonimolobos plures evolutione succedanea ortos rotundatos divisi. 

 Tetrasporangia ad ramulorum latus interius sita, in quoque articulo 

 singula aut plura, oblongo-sphaTica, triangule divisa, rarius trans- 

 verse bipartita. Antheridia plerumque minuta, vario modo confor- 

 mata, eodem modo ac tetrasporangia disposita. 



') Nonnunquam adsunt sporangia bipartita, seirosporse vel csespituli para- 

 sporarum. 



