1356 Eu-Floridege, Compsothamniege, Compsothamnion. 



no nulla et tetrasporangiis in pinnula subsolitariis. Pinnula fertilis 

 ia Compsothamnio thuyoide magis composita tetrasporangia plura 

 plerumque gerit. 



2. Compsothamnion gracillimum (Harv.) Naeg. Ceram. (1861) p. 110, 2129 

 Callithamnion gracillimum Harv. in Hook. Br. Fl. II, pag. 345, 

 (non Agardh), Man. p. 111, Phye. Brit. tab. V, Kuetz. Sp. p. 644, 

 Tab. Phyc. XI, t. 73, f. d-h, J. Ag. Sp. II, p. 43, Epicr. p. 29, 

 Florid. Morphol. t. I, f. 10, Hauck Meeresalgen pag. 77, fig. 28, 

 Buffh. On Anther. (1896) c. ic. (antheridia), Kuckuck Bemerk. II, 



p. 394, fig. 19 (antheridia), Phlchothamnion gracillimum Kuetz. 

 Sp. pag. 655, Callithamnion thuyoides Chauv. Alg. Norm. ? (non 

 aliorum). — Fronde erectiuscula, alterne decomposito-pinnata, di- 

 sticha, a basi articulata, plumulis decompositis, pinnula articuli in- 

 fimi pinnas cujusvis nulla aut sequentibus subminori; tetrasporan- 

 giis ex terminali articulo pinnulre formatis, in pinnula subsolitariis. 

 Hab. in rupibus lirno obductis oceani Atlantici ad oras Anglire 

 (D. na Griffiths, Buffham), Gallias (Crouan), Helgolandise (Kuckuck); 

 in mari Adriatico (Hauck). — Frons csespitosa, 3-7 cm. longa, a 

 basi articulata, 100-200 \x. crassa, ramosissima. Pinnse primariae 

 et secundariaj ambitu sublanceolatae, distiche et alterne pinnulatae. 

 Pinnulge simpliciuscuke aut pinnellis paucis obsitse, ex articulo 

 quoque erumpentes, patentes, 10-15 \u crass c r e; pinnula infima, seu 

 qu?e ex infimo articulo oritur, sequentibus aut minor aut omnino ab- 

 cst (raro in parte inferiore caeteris subpequalis). Articuli cylindracei 

 3-5-plo diametro longiores in ramis primariis, in secundariis bre- 

 viores. Tetrasporangia in pinnula subsingula, ex articulo terminali 

 formata, pinnella una alterave inferiore stipata aut in pinnula 

 simplicissima terminalia, triangule divisa. Cystocarpia in ramulis 

 majoribus sessilia, rotundata aut irregularius lobata. Antheridia 

 in ramulis superioribus intercalaria, cellularum 2-3 (quae conti- 

 nuationem ramuli sistunt) serie terminata, spermatangiis regionem 

 axilem ramuli pleosiphoniam cylindri monostromatici ad instar in- 

 vestientibus. Color roseus. Specimina exsiccatione chartse arcte 

 adha^rent. Specimina e Mari Adriatico provenientia nunquam vidi. 



3. Compsothamnion ?truncatum (Menegh.) Naeg. Beitr. Ceram. (1861) 2130 

 p. 110, Callithamnion truncatum Menegh. in Giorn. botan. ital. 

 1844, p. 288, Kuetz. Sp. p. 644, J. Ag. Sp. II, p. 44, Epicr. p. 29. 



— Filamentis dccomposito-pinnatis, pinnis lineari-lanceolatis apice 

 truncatis pinnulisque alternis, rigidis, erectis, infra articulationem 

 exortis; rachide flexuosa, pinnula inferiorc cujusque ordinis sem- 



