Conjugatffl, Desmidiacese, Cosmarium. 965 



ribus quam longis, quadrangularibus, angulis inferioribus modice 

 prominentibus obtusis, in dorsum late truncatura et retusura su- 

 bito angustatis, lateribus leviter repandis; pyrenoidibus singulis; 

 membrana punctata, semicellulae utriusque in centro ocello orbi- 

 culari instructa. 



llab. in paludibus inter Sphagnum acutifoliura prope 

 Holmiam (Nymann) et ad a Bolltorp, Unnaryd)) in Suecia (Lundell), 

 in Britannia et Hibernia (Arciier, Cooke), in Vogesis (Lemaire), 

 Norvegia (Nordstedt, Wille), Nova Semlia (Wille), America 

 boreali (Wolle). 



77. Cosmarium spetsbergense Nordst. Desm. Spetsberg. et in Hedwi- 2:^14 

 gia 1874, p. 31. — Mediocre, 23 u. crassum, diametro fere duplo 

 longius, 60 s 33, arabitu crenato-verrucosum, ellipticura, medio mo- 

 dice constrictura, sinu lineari, isthmo 20-23 jx. lato; e latere visum 

 anguste ellipticura, raedio levissirae sinuato-constrictura, in utroque 

 polo granulatura; seraicellulis e basi truncata sensira sed modice 

 attenuatis, apice rotundato profunde incisis, incisura extrorsum 

 ampliata, angulis inferioribus rectis; e vertice visis late ellipticis, 



in utroque polo granulatis; pyrenoidibus singulis; membrana mar- 

 ginem versus granulato-verruculosa (verrucis interdum eraargina- 

 tis), in centro seraiceliularura glabra. 

 Hab. in insulis Spetsbergensibus. 



78. Cosmarium liumiie(Gay) Nordst. in litt. 1889, Euasirum ccelaium 2315 

 Gay Essai Monogr. Conjug. p. 59, t. I, f. 17, Euasirum humile 

 Gay in Bull. Soc. Bot. Fr. 1884, — Cellulis rainutissimis, aeque 

 longis ac latis, 12,5 ut.. diara., subrectangularibus, sinu profundo, 

 lineari, isthrao 2,5 [).. lato; semicellulis vertice plano leniter undu- 

 lato, lateribus convexis undulatisque, angulis et inferioribus et supe- 

 rioribus rotundatis ; e vertice et latere visis ellipticis; chlorophoris 

 singulis; nierabrana seriebus duabus verrucarura concentricis ornata. 



Hab. in staguis ad «Roquehaute» Galliae (F. Gay). 



79. Cosmarium solidum Nordst. Freshw. Alg. of N. Zeal. and Austral. 231« 

 p. 48, Cosm. imnciulatum Nordst. et var. iriquelrum Desra. 

 ^petsb. p. 26, t. 0, f. 1-2. — Rectangulare, medio sinu lineari mo- 

 dice constrictum; semicellulis rectangulari-subquadratis angulis 

 inferioribus obtusis, superioribus obtuso-rotundatis, dorso truncatis 

 leviter quadro-crenato-undulato, lateribus rectis vel leviter con- 

 vexis, leviter 5-7-crenato-unduIatis; membrana seriebus granulo- 

 rura minorum verticalibus plus minus regulariter obsessa. Long. 

 22-35 u..; lat. 21-20 a; crass. 16-18 a; lat. isthm. 10-U, jjl. 



