980 Conjugatae, Desmidiacese, Cosmarium. 



De-Not. Eleraent. p. 43, n. 27, t. III, f. 28, Rabenh. Fl. Eur. Algar. 

 III, p. 158, Kirchn. Alg. Schles. p. 51, Cooke Brit. Desm. p. 105, t. 39, 

 f. 4, Wolle Desm. U. S. p. 74, t. 13, f. 5-7, Hansg. Prodr. p. 199, 

 n. 405, De-Toni e Levi Fl. Alg. Ven. III, p. 51, Euastrum Bo- 

 irylu (et angulosum) Ehrenb. Inf. p. 163, t. XII, f. 7, Hetero- 

 carpella Botryiis Bory in Dict. class. 1823, t. 8, Cosmarium 

 deltoideum Corda Alm. Carlsb. 1835, p. 120, f. 18 sec. Cooke, 

 nec Deiponte. ~ Paullulum longius quam latius, constrictione pro- 

 funda, sinu lineari, angusto ; e vertice visum late ellipticum ; se- 

 raicellulis basi recta vel leniter reniformi, apicem versus angustatis 

 apiceque explanato-subtruncatis ; pyrenoidibus biiiis ; membrana jb- 

 qualiter verruculis obsita ; zygotis globosis, aculeis saepe 3-4-fidis, 

 basi haud inflatis armatis; diraens. 40-71^:25-28 (Kirchner), la- 

 tit. isthmi 9-18 p.. 



Hab. in stagnis Angliae (Ralfs, Archer, Hassall, Cooke), 

 Germanise (Rabenhorst, Klebs, Kirchner), Austrise (Grunow), 

 Itaiise (De-Notaris, Nordstedt, De-Toni et Levi, Delponte), 

 Gallise et Vegesorum (Brebisson, Lemaire), Belgii (De-Wildeman), 

 Rossise (Artari), Fennise (Elfving), Groenlandise (Boldt), Daniae 

 (Jacobsen), Hungarise (Schaarschmidt), Bohemiae (Corda, Hans- 

 girCt), Norvegias (Nordstedt), Spetsbergiae (Nordstedt), Sueciae 

 (LuNDELL, Cleve, Wittrock), Novje Semlise (Wille), Americae 

 borealis (Wood, Wolle), Brasilise (Nordstedt), Uruguay (Wille), 

 Japonise (RoY, Bisset) et Novae Zelandiae (Maskell). — Huic speciei 

 dimensiones varias tribuerunt auctores: e. gr. cellulse 68-85 « 52-65 

 (Cooke), 36-111 * 24-78 (Klebs), 72 ^ 57 (Delponte), diam. 35-62 ^. 

 (Wolle). — Var. mesoleium Nordst. in Nordst. et Wittr. Desm. 

 Ital. Tyrol. p. 27, t. XII, f. 2; semicellulis in medio granulis 

 nullis, supra isthraum granulis parvis in series plus rainus evi- 

 denter ordinatis, e basi ipsa visis medio utroque latere tumore 

 minimo instructis. In Tyrolia (Nordstedt). Dimens. cell. 60-68 

 V 48-54, crassit. 28-30 p.., lat. isthrai 22-24 p.. A Cosmario spe- 

 cioso Luud. var. simpUci Nordst. differt hsec varietas isthmo 

 angustiore, pyrenoidibus binis etc. — Var. afghaniciim Schaarsch. 

 Afghan. Alg. p. 245, n. 30, t. 5, f. 19: merabrana tota verrucis 

 minutissimis in series regulares periphericas et radiantes concen- 

 tricas ordinatis munita; cellulis 56 ^; 44. In Afghanistania Asiae 

 (Aitchison). — Var. indicum Josh. Burmese Desmidieae p. 645, 

 t. XXIV, f. 19 et in Notarisia 1886, p. 81 : semicellulis profunde 

 constrictis, centro non inflatis, granulis delicatis regulariter et syra- 



