804 Conjugatfe, Desmidiace:.^, CosmocUidiunu 



Hab. in aquis substagnantibus « Minnesota » Americce borealis 

 (TuRNER). — Dini. 71,5-143^23-25,4. 



Subfamilia secunda Cosmocladieae Nordst. 



Cosmocladieoe Nordst. [1889] iii litteris. — Cellul;o singuloe cosmarioidese, 

 h. e. medio eonstrictae, per lilamenta hyalinula diehotoraa conjuncta^. 



COSMOCLADIUM Breb. [185G] Liste Alg. Falaise p. 133 (Etym. cos- 

 mos monilis et clados ramus), De-Bary in Flora 1865, n. 21, Ra- 

 benh. FI. Eur. Algar. III, p. 53, Kirchn. Alg. Schles. p. 105, Cooke 

 British Desmids p. 78, Dangeard Rech. sur les Algues iuferieures 

 in Ann. Scienc. Nat. 1888 p. 1G3. — Thallus gelatinosus, dicho- 

 tome-subdendroideo ramosus, ramorum axibus apicibusque celiulam 

 geminam gerens. Cellula3 corapress?e, elliptico-reniforraes, chloro- 

 phoro unico centrali et granulis araylaceis (pyrenoidibus) paucis 

 pra^ditpe; contentus viridis. 



Propagatio ut in genere Cosmario seraicellulis singulis ad latus 

 interius proeminentiam prirao minutam et hyalinam, dein accretam 

 et semicellularum earumdem formam sumentem efficientibus; cel- 

 lularum ita efformatarum una axin sequitur, altera discreta fila- 

 raentum (cujus ope axi adha^ret) prsebet. • 



Obs. Teste Dangeard in hoc genere propagatio zoogonidiis (a 

 cl. Rabenhorst indicata) non adest. 



1. Cosmocladium pulchellum Breb. Liste p. 133, t. 1, f. 20, Archer in jgj^ 

 Pritch. Inf. p. 752, t. III, f. G3, De-Bary in Flora 1865, p. 329, 

 Rabenh. Alg. sub n. 19G1, Fl. Eur. Algar III, p. 54 nec Bulnh. 



— Affixum, plano expansum ; cellulis singulis subreniformibus, 22- 

 24 - 12-13, levibus, diametro subduplo longioribus, omnibus latere 

 lato in earadem planitiem distributis. 



Hab. in stagnis, paludibus turfosis Gallia; prope a Falaise » (De 

 Brebisson), in Silesia ad (( Bunzlau » (Hilse). 



2. Cosmocladlum saxonicum De-Bary Conjug. p. 76. Rabenh. Fl. Eur. 1913 

 Algar. III, p. 51, Cooke Brit. Desm. p. 78, t 35, f. IG, Dang. Rech. 



sur les Alg. infer. 1888, p. 163, Cosmocladium pulchellum Bul- 

 nlieim in Rabenh. Alg. n. 1222!, Rabenh. Krypt. Flor. Sachs. p. 132, 

 nec Breb. — Non affixum, in muco gelatinoso fluctuante libere nidu- 

 lans, raniiflcatione in duas vel tres directiones distributa; cellulis 

 elliptico-reniforraibus, 19 ^; 12, levibus, luteo-viridibus, latere lato 

 varie sitis. 



