934 CoDJugatae, Desmidiaceae, Cogmarium. 



Hab. in aquis stagnantibus totius Europae et ubique fere vul- 

 gare, passim non animadversum, e locis variis Anglise et Scotise 

 (Archer, Ralfs, Cooke), Galli?e et Vogesorum (Brebissqn, Le- 

 maire), Gerraanise (Kirchner, Klebs, Rabenhorst), Norvegise 

 (WiLLE, Nordstedt), Spetsbergia3 (Nordstedt), Nova^ Semliae (Wil- 

 le), Austria3 (Grunow), Suecise (Lundell, Cleve), Bohemise (Hans- 

 girg), Belgii (De-Wildeman), Hungarise (Schaarschmidt), Italia? 

 (De-Toni, Levi), Sibiriae et Groenlandise (Boldt), Araericse borealis 

 (WooD, Wolle). — Var. parcum Wille Norges Alg. p. 35, t. 1, f. 21, 

 Hansg. Prodr. p. 278: seraicellulis reniformi-compressis, late ellipticis 

 vel sub hexagono-reuiforraibus, e latere suborbicularibus e vertice 

 ellipticis, vix raedio tumidis raembranaque levi ; dimens. 18,5 5? 18, 

 lat. isthra. 6 [>.., crass. 9-10,5. In turfosis Norvegiae (Wille), Sibiriae 

 (Boldt), Bohemiae (Hansgirg). — Var. crenulatum Naeg. Einz. Alg. 

 p. 120, t. VII A, f. 7 c: semicellulis paullo brevioribus, leviter si- 

 nuato-crenulatis, crenis 7. — Var. omphalum Schaarschm. Magyar,, 

 Desmid. f. 9: parvum, paullo longius quam latum, medio profun- 

 dissime constrictum, sinu lineari; seraicellulis subreniforraibus in 

 medio verruca instructis, e vertice oblongo-ellipticis, raedio inflatis, 

 breviter cuspidatis, a latere circularibus, raedio utrinque turaore 

 prseditis; membrana achroa, glabra; dimens. 18^16, lat. isthm. 

 47 [j-. In lacu prope « Nagy-Pesteny » Hungaria^. — Forma depres- 

 sum Schaarschm. loc. cit. p. 270, f. 10: semicellulis corapressis, , 

 dorso latissime truncatis, a vertice visis cylindricis, apicibus ro- 

 tundatis; dimens. 20^18. In lacu prope « Nagy-Pesteny » Hun- 

 garia3. — Var. triquetrum Nordst. in Hedwigia 1876, p. 14: se- 

 raicellulis e vertice visis trigoniis, lateribus rectis vel levissirae re- 

 tusis. In insulis Spetsbergensibus (F. R, Kjellman). 



5. Cosmarium quadratulum (Gay) De-Toni, Euastrum quadratulwn 2242 

 Gay Essai Monogr. Conjug. p. 58, t. I, f. 15. — Cellulis rainutis- 

 simis, 15:^11, rectangularibus, sinu valde profundo, acutangulo, 

 isthrao 2 [)-. lato; seraicellulis rectangularibus, apice et lateribus 



vix sinuatis, angulis truncatis rotundatisque; pyrenoidibus singu- 

 lis; membrana glabra. 



Hab. in stagnis turfosis ad « Gourgons, Chateauneuf-de-Randon» 

 circa « Montpellier » Gallise (F. Gay). 



6. Cosmarium leve Rabenh. FI. Eur. Algar. III, p, 161, Wolle Desm. 2243 

 U. S. p. 62, t. 15, f. 10, Hansg. Prodr. p. 193, n. 382, Cooke 

 Brit. Desm. p. 94, t, 42, f. 17, — Parvura, 14-16(-21) latura, 26- 



30 a, longura, levissiraura, plus minus longius quara latuni, ad 



