Conjugatse, Desmidiacese, Pleurotaenium, 901 



dise raargine turaido, brunneo, apicibus late truncatis, altero ssepe 

 crenulato; raerabrana granulato-punctata. 



Hab. m aquis stagnantibus per totara Europara passira, certe 

 in pluribus locis adiiuc non aniraadversura ; indicatur ex Italia 

 (De-Notaris, Dklponte), Gallia (Brebisson, Petit), Britannia (Ar- 

 CHER, Ralfs, Cooke), Germania (Kirchner, Rabenhorst), Bohe- 

 mia (Hansgirg), Suecia (Cleve, Lundell), ad « Bornholra » (Nord- 

 stedt), in Rossia (Artari), Hungaria et Serbia (Istvanffi), Fennia 

 (Elfving), America boreali (Bailey, Wolle) ad « Mauna Kea » ins. 

 Sandvic. (Nordstedt). Dimensiones cellulae 420-560 ^ 40-60. « Prio- 

 ritatis lege, ut fecit Rabenhorst, Pleuroicenmm crenulaium (Eh- 

 renb.) Rabenh. aptius nuncupandura n. 



13. Pleurotaenium coronatum (Breb.) Rabeuh. Fl. Eur. Algar. III, 2i7i 

 p. 143, Hansg. Prodr. 190, n. 368, Kirchn. Alg. Schles. p. 144, Do- 

 cidmm coronaium Breb. in Ralfs Brit. Desmid. p, 217, t. XXXV, 



f. 6, Liste p. 147, n. 3, Archer in Pritch. Inf. p. 745, Wolle Desm. 

 U. S. p, 49, t. 11, f. 9-10, Cooke Brit. Desra. p. 13, t. 6, f, 1, 

 — Pl. Trabeculce habitu, 22-58 [j. latura, (ad 540 ^. longum), ro- 

 bustum 8-15-plo longius quam latum, raedio constrictura, stricturae 

 margioe tumido-prominente; semicellulis e basi latiori leaiter nn- 

 dulata polum versus paulum attenuatis, apicibus truncatis, denti- 

 bus obtusis 10-11 coronatis; membrana verruculis 10-12 in series 

 alternantes dispositis instructa. 



Hab. ad •« Falaise » in Gallia (De-Brebisson), prope « Liibeck » 

 locis paludosis in foliis putridis, in Germania (R. Haecker) ; in 

 Fennia (Elfving), Rossia (Artari); in Hibernia (Archer), Bohemia 

 (Hansgirg), America boreali (Wolle) et Brasilia (Wille). 



14. Pleurotaenium nodosum (Bail.) Lund. Desm. Suec. p. 90, Wood 2172 

 Freshw. Alg. U. S, p. 1*^0, Nordst. Fresw. Alg. of N. Zeal. and Au- 

 stral. p. 65, Docidium nodosum Bailey Mior. obs. t. I, f. 4, Ralfs 

 Brit, Desmid. p. 218, t, XXXV, f. 8 (superficie levi!), Archer in 

 Pritch. Inf. p, 745, Rabenh. Fl. Eur. Algar. III, p. 145, Cooke 

 Brit. Desm. p. 12, t. 7, f. 2, Wolle Desm. U. S. p. 50, t. XI, f. 

 11-12, t. XII, f. 20 Docidium nodosum Bail. var. hibernicum 

 Archer in Quart, Micr. Journ. III, 1872, p. 43, Closierium oio- 

 dosum Bailey in Amer. Journ. I, c. f. 3. — Validissimura, 280- 

 400 =5= 48-54, apice 24-40 w.. latura, medio 45-55 ^. latum, undula- 

 tum, spinulis sparsis hirsutum, medio valde constrictum, diametro 

 8-10-pIo longius; seraicellulis basi dilatata leviter attenuatis, 4-un- 

 datis, apicibus quasi productis, latissirae truncatis; locello apicali 



