Conjugatae, Desmidiacese, Staurastrum. 1209 



— Dimens. 42; lat. isthmi 15 a. — Var. subgracile Wittr. Go- 

 tlands och Oelands Sotvattensalger p. 51 : processibus longioribus; 

 semicellulis a vertice visis triangularibus, angulis productis, late- 

 ribus concavis. Ad «Norra Mockleby sn., Bettorp» in Oelandia Sue- 

 eiae (Wittrock); etiam in Sibiria (Boldt). — Dimens. cell. c. 

 proc. 24-28^35-45; longit. proc. 6-12 fji. ; lat. isthm. 8-9 fx. — 

 Fortasse huic varietati adscribendum videtur Phycastrum crenu- 

 laium Naeg, 

 195. Staurastrum gracile Ralfs in Ann. Nat. Hist. XV, 1845, p. 155, ^'^'i'?' 

 t. XI, f. 3 et Brit. Desmid. t. XII, f. 12, Breb. Liste p. 139, 

 Rabenh. Krypt. Flor. v. Sachs. p. 192, Fl. Eur. Algar. III, p. 211, 

 Archer in Pritch. Inf. p. 742, t. III, f. 28 et 29, De-Not. Element. 

 p. 54, t. V, f. 49, Delp. Specim. Desm. subalp. p. 153, t. 12, f. 12-21, 

 Wolle Desm. U. S. p. 133, t. 43, f. 16-17, Cooke Brit. Desm. p. 170, 

 t. 58, f. 6, Hansg. Prodr. p. 213, Phycasirum gracilc Kuctz. Spec. 

 p. 181, Goniocysiis {TrigonoGysiis) gracilis Hassall Brit. Freshw. 

 Alg. p. 372. — Mediocre , granulato-asperura , granulis in series 

 transversas ordinatis; semicellulis ventre valde iuflatis, dorso trun- 

 catis, angulis in cornu rectum, achroum, gracile, apice trifidum pro- 

 ductis, a vertice triradiatis, radiis elongatis, tenuibus, apice 3-api- 

 culatis, hyalinis, lateribus sinuatis. 



Hab. in stagnis paludibusque in Italia (De-Notaris, Delponte), 

 Gallia (Brebisson, Petit), Vogesis (Lemaire), Belgio (De-Wil- 

 deman), Britannia (Ralfs, Archer, Cooke, Hassall), Germania 

 (Rabenhorst), Hungaria (Istvanffi), Bohemia (Hansgirg), Suecia 

 (Cleve, Lundell), Norvegia (Nordstedt, Wille), Fennia (El- 

 fving), America boreali (Wood, Wolle), Brasilia (Nordstedt), Ja- 

 ponia (RoY, Bisset), Birmania (Joshua). — Dimens. 72=; 50 (Delpon- 

 te); dimens. 42:^:55-60 (Kirchner); diam. 40-50 a. (WoIIe). — Var. 

 bicorne Bulnh. in Rabenh. Alg. sub n. 1224. Fl. Eur. Algar. III, 

 p. 211:late ellipticum, utroque polo in cornu gracile, apice tricus- 

 pidatum subito attenuatum. Per totam Europam passim. — Var. 

 nanum Wille Bidrag til Kundsk. om Norgos Ferskvandsalger p. 

 46, t. II, f. 31: dimidio rainus: semicellulis a vertice visis 4-ra- 

 dlatis. Ad aRoednais)) Norvegiae (Wille), ad aTunguska» Sibiriop 

 (Boldt). — Long. 19 a.; lat. diagon. 36 a., lat. later. 27 p. ; lat. isthm. 

 a. (Willo); Dimens. 31,6 :i 20,4; diagon. max. 31,2 [jl. ; lat. isthm. 

 7,2 a. (Boldt). — Var. coronulatum P.oldt Sibir. Chloroph. p. 116, 

 t. 5, f. 28: semicellulis a fronte visis dorso leviter convexo, pro- 

 rainentiis 4-6 emarginato-truncatis praidito; a vertice visis 4-ra- 



