Conjugatse, DesmidiacecB, Staurastrura. 1201 



Hab. in pratoruin fossa ad « Kloster Zelle» Saxoniae (Raben- 



HORST); in Florida Americte bor. (J. W. Bailey). — Diani. 25-30 [j.. 



Seclio 8. ScraicelluUe spinis carontes, o frontc ct vertico visas angulis pro- 

 miuentia papillajrormis conspicua rotundata vcl proccssu clongato-capitato 

 terminatis. 



173. Staurastrum tumidum Brob. in Ralfs Desmid. p. 126, t. XXI, 2901 

 f. 6, Liste p. 143, Rabenh. Alg. n. 1594, Fl. Eur. Algar. III, p. 201, 

 Wolie Desm. U. S. p. 120, t. S9, f. 1-2, Cooke Brit. Desm. p. 105, 



t. 55, f. 8, t. 57, f. 1, Binatella tumida Breb. Alg. Falaise p. QQ, 

 Phycasirmn twnidmn Kuetz. Spec. Alg. p. 179, Slaurastrum 

 orbiculare Menegh. in Linna^a 1840, p. 225 nec Ralfs. — Per- 

 niagnum, subleve, sinu rectangulari ; semicellulis ovalibus vel el- 

 lipticis, iatissime rotundatis, margiue achroo transverse striolatis, 

 utroque fine plerumque processu brevi-conico praeditis, a vertice 

 triangularibus, angulis processu raammillato coronatis, lateribus 

 convexis; zygotis ovoideis, raembrana spinis conicis, obtusis, sparsis 

 ornata. 



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

 Petit), Germania (Rabenhorst), Suecia (Cleve, Lundell), Nor- 

 vegia (Nordstedt, Wille), Dania (Jacobsen), Araerica boreali 

 (Wolle). — Dimens. cell. 170^^92-112; zygota 126^92; spiuEe 

 14 .'/. longa?. Chlorophora, ex Lundell, quaterna, lamiuaria, lateralia. 



174. Staurastrum grande Bulnh. in Hedwigia 1861, p. 51, t. IX A, f. 14, 2902 

 Lund. Desra. Suec. p. 72, Wolle Desm. U. S. p. 120, t. 39, f. 3-4. 



— Magnura, fere tain longum quam latura,sinu profunde acutangulo; 

 seraicellulis ellipticis, utroque fine obtusis, a vertici tri-quadrangu- 

 laribus, lateribus leviter retusis, augulis obtusangulis; parietibus 

 cellulae chlorophoris Iamin£eformibus binis iatus instructis; membra- 

 na subtiliter punctata. 



Uab. in Saxonia (Bulnheim); ad Upsaliara et «Bergsbrunna» iu 

 Uplandia, ad «Ferasjo et Rappe» in Smolandia SueciiB (Lundell); 

 ad « Minneapolis » Americae borealis (Wolle). — Dimens. cell. 84- 

 88 ij 80-82; latit. isthmi 22 a. — Forraa majus Luud. Desra. Suec. 

 p. 72, t. IV, f. 11: semicellulis pauUo longioribus, dorso minus 

 convexis, a vertice visis lateribus raagis retusis angulisque subtu- 

 midis, 3-4-goniis. Ad «Rappe» in Sraolandia Suecia3. Quod ad stru- 

 cturam massa^ chlorophyllacea; pertiuet, haec forraa a fronte visa 

 cura Xanthidio armaio Breb, beue congruit. 



76 



