1090 Conjugatae, Desmidiacea), Euastrum. 



(liametro duplo vel paBne triplo longius, 130 >i' 55-70, profunde con- 

 strictum, quasi pinnato-lobatum, a vertice oblongo-quadrangulare, 

 lateribus profunde sinuatum; seraicellulis quinquelobis, lobis infe- 

 rioribus latioribus, sinuato-emarginatis, utrinque et tumore majori 

 et quaternis minoribus cruciatim ioterpositis; lobo polari abbre- 

 viato latissime truncato, profundo bifido, segmentis superne leniter 

 retusis, lateraliter rotundatis, centro tumidulis; lobis intermediis 

 lateraliter productis, horizontali-patentibus, in apice rotundatis et 

 tumore centrali majori et utrinque tumore minori instructis. 



Hab. in stagnis in Britannia (Ralfs, Cooke), in Suecia (P. T. 

 Cleve, Lundell), in pratis paludosis prope «Grimma» Saxonise (P. 

 Riciiter), in Gallia (Petit), Norvegia (Norstedt), Lulea Lappm. 

 (Lagerheim), Fennia (Elfving), America boreali (Wolle). — Var. 

 intermedium Racib. Desra. Polon. p. 37, tab. IV, f. 4: seraicellulis 

 quinquelobis, latioribus quam longioribus, tumoribus 7 in series 3 

 ordinatis prseditis h. e. 3+24-2. Prope «Toporowy staw» in mon- 

 tibus tatricis (Raciborski). — Dim. cell. 105 ^ G7; latit. isthmi 17 [j.. 



56. Euastrum liumerosum Ralfs Brit. Desm. p. 82, t. 13, f. 2, Archer 

 in Pritch. Inf. p. 729, Rabenh. Alg. sub n. 484 (singulatim!), Fl. 

 Eur. Algar. III, p. 182, Wolle Desm. U. S. p. 99, t. 28, f. 12-13, 

 Cooke Brit. Desm. p. 66, t. 32, f. 3 — Euastro pinnato Ralfs 

 simillimura, a fronte conspectura minus corapressum, circiter duplo 

 longius quam latius, 110 ^ 65-75; semicellulis subquinquelobis, lobis 

 basalibus leviter eraarginatis, turaoribus in utraque semicellula tri- 

 bus basalibus, 2 supra basin et in lobo polari basi minus angusta- 

 to, lobis intermediis adscendenti-suberectis; membrana subtiliter 

 striolata. 



Hab. in stagnis in Britannia (Ralfs, Cooke), Gallia (Brebisson), 

 Suecia (Lundell, Cleve), Norvegia (Nordstedt), Germania (Raben- 

 iiorst), Fennia (Elfving), Lulea Lappm.; in America boreali 

 (Wolle). — Var. intermedium Racib. Desm. Polon. p. 37, t. IV, 

 f. 5: semicellulis habitu E. affmis Ralfs, tumoribus (ut in forma ty- 

 pica) 7 pra^ditis (3+2+2). Ad « Niepolomice» in Polonia (Raci- 

 borski). — Dira. cell. 93-96 «52-54, latit. isthra. 16 a. 



57. Euastrum ventricosum Lund. Desm. Suec. p. 18, t. 2, f. 2, Wolle 

 Desm. U. S. p. 160, Freshw. Alg. U. S. p. 38, t. 58, f. 1-3. — Ma- 

 gnum, diaraetro 4imidio longius, ambitu subellipticum, medio pro- 

 funde consjirictum, sinu angusto lineari; semicellulis basi valde 

 dilatatis, trilobis, lobo polari abbreviato, sursum subito dilatato, 

 inciso-bifldo, inter laterales insiuuato, e vertice quadrilobulato. 



262 



