1344 Eu-Florideje, Callithamniefe, Seirospora. 



J. Ag. Sp. II, p. 09 est, suadente quoque loco natali, Seirospora 

 fiaccida Kuctz. 



105. Callithamnion baccatum J. Ag. Alg. Joseph. Exped. (1870) p. 364 

 est Vickersia baccata (J. Ag.) Karsakoff. 



106. Callithamnion subnudum Rupr. Tange Ochot. Meer. t. 18 cst An- 

 tithamnii sp. 



107. Callithamnion Corallina Rupr. Tange Ochot. Meer. t. 18 est An- 

 tithamnii sp. 



108. Callithamnion Graeffii Grun. Alg. Fidschi p. 7 est Antithamnii sp. 



109. Callithamnion subtile Kuetz. Sp. p. 896 (e mari Jonico) videtur 

 Seirosporcs sp. 



110. Callithamnion tingitanum Schousb. proximum Antithamnio cru- 

 ciato, nullo modo generi Seirospotxe adscribendum est. 



Obs. Species alire nonnullae ad Rhodochorton, Griffithsiam etc. 

 pertinent. 



SEIR0SP0RA Harv. [1849] Pbyc. Brit. tab. XXI (Etym. seira eatena 

 et spora semen), Kuetz. Sp. (1849) p. 896, Scbmitz Die Gatt. Mi- 

 crothamnion (in Rer. d. deut. bot. Ges. XI, 1893) p. 273, Engl. & 

 Prantl Natiirl. Pflanzenfam. (1897) p. 490, Microthamnion J. Ag. 

 [1892] Analecta algologica pag. 18 [non Microthamnion Naegeli 

 [1849] in Kuetz. Sp. p. 352, quod genus ad Chlorophyceas pertinet], 

 Miscosporium Naegeli [1861] Beitr. Ceram. p. 129, Callithamnion 

 subgen. Seirospora Farl. New Mar. Alg. of N. Engl. pag. 129, 

 Callithamnion sect. Seirospora Ardiss. Rivista Alg. Medit. (1901) 

 p. 1038, Leptothamnion Kuetz. [1849] Sp. p. 896, Callithamnii, 

 Phlebothamnii, Confervce sp. auct. — Frons ut in Callithamnio 

 sed cellulis uninucleatis constituta. Antheridia et procarpia Calli- 

 thamnii. Nucleus fertilis caespitulum sistens laxissinium filorum 

 sporigerorum repetito suhdichotome furcatorum, quorum cellube fere 

 omnes (paucis inferioribus exceptis) in carposporas transmutantur. 

 Sporangia cruciatim, rarius triangule, divisa, in ramis superioribus 

 frondis lateraliter disposita, in apicc superiori cuiusque articuli 

 singulatim provenientia. Caespituli parasporarum (seirosporarum) 

 in individuis tetrasporangiferis sa^pe pnesentes, terminales, e iilis 

 articulatis repetito furcatis laxiusculis constituti. 



Obs. Genus singulare, a Caltilhamnio, characteribus allatis, 

 strictc dignoscendum. Jam clarissimus Bornet statuit (Not. algol. 

 I, p. XIV-XV) catcnulas cellularum ramoso-corymbosas terminales, 

 sic dictas seirosporas, nunc caespites sistere parasp'orarum nunc 



