Conjugatae, Desmidiaceoe, Cosmarium. 943 



latum, 10-11^^8-12 (-15), siiiu mediaiio profundo, extrorsum valde 

 ampliato, isthmo 5-7,5 [j.. lato; seinicollulis late ovatis vel depres- 

 so-lieraisphaericis; chlorophoris in utraque semicellula singulis; 

 merabrana flava, brunneola vel rufescente, levi ; zygotis quadran- 

 gularibus, levibus, 



Jfab. iii stagnis et aquis lente fluentibus Anglire (Ralfs, Cooke), 

 Gallije (Rrebisson, Petit), Vogesorum (Lemaire), Belgii (De-Wil- 

 deman), Germania3 (Kirchner, Klebs, Rabenhorst), Hungariae (Is- 

 TVANFEi), AustrioB (Grunow), TyroHoe (Nordstedt), Bohemiae (Han- 

 sgirg), Sueciae (Lundell\ Norvegia^ (Nordstedt, Wille), Danise 

 (Jacobsen), Italia? (Wittrock, Nordstedt), Novse Semlise (Wil- 

 le', Groenlandia} (Boldt), Americae borealis (Wolle); in Nova Ze- 

 landia (S. Berggren). — Var. arctoiforme Wille Ferskvandsalger 

 fra Novaja Semlja p. 44, t. XIII, f. 40; minimum, circiter dimi- 

 dio longius quam latum, l^i^ll, in medio angustatum, 7 u.. cras- 

 sam, isthmo 9 [j.. lato; semicellulis obtriangularibus, apice latissi- 

 me rotuudato, a latere visis obovatis fere cylindraceis, a vertice 

 visis ellipticis apicibus obtuse rotundatis. Ad uGaskap» Nov.ie 

 Semlife. — Forma trigonum Nordst. Freshw. Alg. of N. Zeal. and 

 Austral. p. 61, t. III, f. 16: semicellula 8,5^ 14, isthmo 8 y.. lato 

 a vertice visa trigona, lateribus leviter convexis angulis rotunda- 

 tis; membrana luteola. Ad aArthur Pass» in Nova Zelandia (S. 

 Berggren). Una tantum semicellula visa, huc verisirailiter perti- 

 nens. — Var. intermedium Nordst. loc. cit. t. III, f. 17, Botaniska 

 Notiser 1887, p. 162: sinu non lineari, mox ampliato; cellulisll 

 ^ 10, circ. 8 a. crassis, isthmo 8 a. lato, a vertice visis raedio le- 

 viter tumidis; membrana luteola seu achroa. Ad aOmatangi)) in 

 Nova Zelandia (S. Berggren). — Qua3 forraa ad Cosm. aHphcvro- 

 sporum Nordst. valde accedens status transitorius inter hanc spe- 

 ciem et C. iinclum efficit. Pluribus formis interraediis zygotiferis 

 examinatis hse duae species fortasse melius in unara reduci debent. 

 26. Cosmarium asphaerosporum Nordst. in Wittr. et Nordst. Alg. aq. 2263 

 dulc. exs. n. 269 (1879), Cosmarium Schliephackcanum Gvm\. i. 

 spetsbergensis Nordst. Desm. arct. p. 24, tab. 7, fig. 15, Hedwigia 

 1876, p. 19. — Semicellulis e vertice visis subrhomboideo-ellipticis, 

 medio utrinque verruca depressa, ssepe vix visibili ornatis; a latere 

 conspectis obovato-circularibus, apice truncato rotundatis; inem- 

 brana hyalina ; zygotis rectangularibus, lateribus paulum tumidis, 

 apicibus subretusis (h. e. interdum ellipticis, apicibus rotundatis v. 

 plus rainus irregularibus, fere ut in Cosmario iincto), a latere 



