1098 Conjugatae, Desmidiaceae, Euastrum. 



Ralfs Hrit. Desm. p. 85, p. p., t. 13, f. 5, Rabenh. Alg. n. 1853 et 

 .sub n. 1902, Fl. Eur. Algar. III, p. 183, De-Not. Elem. p. 36, 

 t. 3, f. 16, Wolle Desm. U. S. p. 101, t. 28, f. 1-2, Cooke Rrit. 

 Desm. p. 71, t. 34, f. 2, HaQSg. Prodr. p. 206, n. 430, Kirchn. 

 Alg. Schles. p. 158. — Mediocre, subduplo diametro longius, 62- 

 90::; 36-54; semiceliulis subtrilobis, tumoribus 3 basalibus instru- 

 ctis, insuper binis et in lobo polari 2; e vertice visis 2-ies 4-un- 

 dulato-crenatis ; raembrana levi vel subtiliter punctata. 



Hah. in stagnis et fossis in Britannia (IIassall, Ralfs, Cooke), 

 Gallia (Brebisson), Italia (De-Notaris), Germania (Rabenhorst, 

 Kirciiner), Bohemia (Hansgirg), Austria (Grunow), America 

 boreali (WooD, Wolle). — Ex Boldt Studier p. 91, videtur mera 

 Euastri ansati forma. 



70. Euastrum sinuosum Lenorm. in herb. 1845 sec. Kalfs Brit. Desm. 2642 

 Archer in Pritch. Inf. p. 729, Lund. Desm. Suec, p. 20, Nordst. 

 Freshw. Alg. of N. Zeal. and Austral. p. 33, Euastrutn circulare 



[6 Ralfs Brit. Desm. p. 85, t. 14, f. 3 b-c, Euasf?'u?n circulare 

 b falesiensis Br6b. Liste pag. 122, Rabenh, Fl. Eur. Algar. III, 

 pag. 183, — Habitu quasi Euastri circularis Hass.; semicellulis 

 ad basin versus tumoribus quinis, in lobi polaris segmentis binis 

 instructis. 



][ab. in Ga Ilia (Lenormand, Brebisson), Fennia (Elfving), Nor- 

 vegia Sibiria (Boldt), Bohemia (Hansgirg), Suecia (Lundell), Nova 

 Zelandia (S. Berggren sec. Nordstedt), Birmania(R. Romanis sec. 

 Joshua); ad « Mauna Kea» ins. sandwicensis aHawaii» (S. Berg- 

 gren). — Ab Euastro ansato differt lobis basalibus magis di- 

 stinctis et sinuatis et imprimis lobo polari (oblique) a vertice viso 

 plus minus distincte quadrilobu lato, a latere truncato et a fronte 

 dilatato quare ad Euasirum circulare Hass. haud est referendum. 

 Specimina novo-zelandica a claro Berggren reportata pra^bent, sec. 

 Nordstedt, has dimensiones : longit. 87 ix., lat. "50 p.., crass. 27 p.. 



71. Euastrum pingue Elfv. Anteckningar om Finska Desmidieer p. 7, 2643 

 t. I, f. 3, Wolle Desm. U. S. p, 105, t. 27, f. 1-3. — Submedio- 

 cre, circiter dimidio longius quam latius, arabitu subelliptico, in- 

 cisura mediana profunda, angustissima; semicellulis subtriangula- 

 ribus, e basi subventricosa leviter attenuatis in apicera paullura 

 protractuni rotundato-truncatura et leviter inciso-bifidura, angulis 

 inforioribus obtusis, lateribus inferne rotundatis, granulatis, super- 

 ne retusis, subglabris, apice granulato ; raembrana granulis plus 

 niinus conceatrice dispositis, ad basin semicelluI.Te densioribus or- 



