)218 Conjugatae, Desmidiacea^, Staurastrum. 



27 « 25, diam. max. 33, lat. isthm. 10,5 (j.. — Subsp. cosmospinosum 

 Berg. Et lille Bidrag til Boriiholms Desraidi6-Flora ia Botan. 

 Tidsskr. 1889, p. 147, t. VI, f. 8. — Mediocre, paullo longius quam 

 latius, medio profunde constrictum; sinu in exteriorem partem cre- 

 sceixte; semicellulis elliptice subtriangularibus, apice rotundato pro- 

 minentiis raunito, in lateribus granulis in quaternos ordines di- 

 stributis ornatis; a vertice visis tetragoniis, margine paullo inflexo 

 granulis acutis brevioribus munito, angulis in spinas excurrenti- 

 bus, intra marginera 6, raro 2, prominentiis ornatis, medio levi- 

 bus. Ad « Mosehul v. Landevejen Ronne Almindingen » Bornhol- 

 mise (F. Bergesen). — Dimens. 43 « 38. Latit. isthmi 13 u.. Non 

 sine dubitatione hanc formara ad St. aculeatum refert cl. auctor 

 praecipue quod spinae non furcatae sunt. Fortasse etiam fieri potest, 

 ut ad St. saxonicum Reinsch subspecies hcec referenda sit. 



212. Staurastrum vestitum Ralfs Brit. Desm. p. 143, t. XXIII, f. 1, 2940 

 Breb. Liste p. 137, Rabenh. Krypt. Flor. v. Sachs. p. 193, Alg. 

 sub n. 1444, Fl. Eur. Algar. III, p. 218, Archer in Pritch. Inf. 



p. 742, t. III, f. 30-31, Delp. Specim. Desm. subalp. p. 158, t. 13, 

 f. 46-49, Kirchn. Alg. Schles. p. 177, Wolle Desm. U. S. p. 138, 

 t. 45, f. 28-30, Cooke Brit. Desm. p. 175, t. 60, f. 3. — Subma- 

 gnum, latius quam longius, margine prominentiis brevibus trunca- 

 tis vestitum, angulis longe productis, rectis vel convergentibus, 

 denticulatis, achrois, in apice trifurcatis; semicellulis ellipticis vel 

 latere ventrali inflatis subtrigoniis, undique verruculoso-asperis, a 

 vertice triradiatis, radiis elongatis asperis, in apice trifurcatis, la- 

 terum medio prominentiis geminis, modo subulatis modo bifur- 

 catis. 



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

 Petit), Vogesis (Lemaire), Germania (Rabenhorst, Kirchner), 

 Suecia (Cleve, Lundell), Norvegia (Nordstedt, Wille), Italia 

 (Delponte), Dania (Jacobsen), America boreali (Wolle), Brasilia 

 (Nordstedt). — Dimens. 64 ^ 43 (Delponte) ; 03-78 ^ A\ (Kirchner) ; 

 diam. 62-90 w. (WoIIe). — Var. ornatum Istv. in Notarisia 1886, 

 p. 240: semicellulis dorso mucronibus bidentatis ornatis. In tur- 

 fosis ad (( Cserna, Rozsahegy )) in lacunis prope fl. (( Vag )) Huu- 

 gariee. — Diam. 50 fx. — Var. dJstortum WoIIe in Bull. Torrey Bot. 

 Club vol, IX, n. 2, p. 20, t. XXVII, f. 14, Hedw. 1883, p. 191: 

 asymmetricum, aculeis irregulariter dispositis. In America boreali. 



213. Staurastrum Heleneanum WoIIe Desm. U. S. p. 133, t. 44, f. 2941 

 6-7 et in Iledwigia 1882, p. 79. — Parvum, subtiliter granulatum, 



