1066 Conjugatae, Desmidiaceffi, Euastrura, 



U. S. p. 97, Cooke Brit. Desm. p. 63, Hansg. Prodr. p. 203, De- 

 Toni e Levi Fl. Alg. Ven. III, p. 56. — Celiulse ambitu oblongft? 

 vel ellipf.ica?, raedio transverse profunde incisse, compressae, lateri- 

 bus symmetrice sinuatse vel lobatae, apicibus rotundatae vel trun- 

 catae ibique sinuato-emarginati^ vel plus minus anguste inciso-bi- 

 lobatse, e vertice visae oblongse, prominentiis 1-pluribus hemisphne- 

 ricis in unoquoque latere. Chlorophora in utraque semiceliula sin- 

 gula, axilia, e tseniolis longitudinalibus radiantibus constituta, py- 

 renoide singulo instructa v. bina, secus axin longitudinalem di- 

 sposita. 



Generatio zygotis globosis, verrucis simplicibus vel aculeis ob- 

 sessis. 



.4. SemicelUilas vertice late emarginatae, nec incisura angusta donatfe. 



1. Euastriim verrucosum Ehrenb. Abh. 1833, p. 247, Inf. p. 162, t. 2573 

 XII, f. V excl. syn. Cord., Ralfs in Transact. of the Bot. Soc. of 

 Hldinb. II, 1, p. 125, t. X, f. 3, Brit. Desmid. p. 79, t. XI, f. 2, 

 Rabonh. Alg. sub n. 51, 286, 303 et n. 1641, Pertj Kl. Lebensf. 

 p. 208, Focke Phys. Stud. I, p. 44, t. I, t. II, f. 12, 13 et 25, Breb. 

 Liste p. 123, De-Not. Element. pag. 33, t. II, f. 10, Rabenh. Fl. 

 Eur. Algar. III, p. 179, Kirchn. Alg. Schles. p. 100, WoIIe Desm. 

 U. S. p. 100, t. 26, f. 1-5, Delp. Specim. Desm. subalp. p. 94, t. 6, 

 f. 13-15, Cooke Brit. Desm. p. 63, t. 31, f. 1, Hansg. Prodr. p. 204, 

 Cosmarium cornulum Corda Alm. d. Carlsb. 1839, t. 5, f. 30, 

 Cosmartum quadrangulare Corda loc. cit. t. 5, f. 32?, Cosma- 

 rium verrucosum Menegh. Synops. in Linn. 1840, p. 222, Eua- 

 strum papulosum Kuetz, Spec. Alg. p. 172. — Magnum, late ova- 

 tum, paullo longius quam latius, 80-102 ^ 65-97, medio profunde con- 

 strictum, sinu extrorsum dilatato; semicellulis trilobatis, lobis trian- 

 gularibus, divergentibus, apice late et profunde sinuatis, tumoribus 

 basalibus ternis magnis; a latere visura ovato-oblongum, sinuato- 

 lobatum, lobis octo in apice rotundatis, polaribus singulis porrectis, 

 lateralibus ternis; e vertice conspectum oblongura, gibbis 8 in- 

 structum ; merabrana granulato-verrucosa. 



Hab. in stagnis in Italia (De-Notaris, Delponte), Oallia (Bre- 

 BissoN, Petit), Britannia (Ralfs, Cooke), Belgio (De-Wilde- 

 man), Gerraania (Rabeniiorst, Kirciiner), Boheraia (IIansgirg, 

 Corda), Suecia (Lundell, Cleve), Norvegia (Nordstedt), Dania 

 (Jacobsen), Rossia (Artari), Lulea Lappm. (Lageriieim), Fennia 

 (Elfving), Hungaria (Istvanffi - Sciiaarschmidt) , Groenlandia 



