ConJugataG, Desmidiaceje, Staiirastruni. 1175 



110. Staurastrum asperum Brob. ia Ralfs Brit. Desm. p. 139, t. XII, 2s.3s 

 1". 6, t. 2.'., f. 12, Rabeuh. Fl. Eur. Algar. III, p. 209, Wolle Desm. 



U. S. p. 127, t. 42, f. 7-8, Cooke Brit. Desm. p. 154, t. 53, f. 4. 

 — Mediocre, 52:^40-45, granulis minutis asperum; semicellulis 

 late elliplicis, subinflatis, utroque fino rotundatis, lateribus rectis, 

 granulis in series excentrice curvatas marginalos ordinatis; zygo- 

 tis orbicularibus, spinis apice 2-ios furcatis instructis. 



Ifab. in fossis, fodinis turfosis in Gallia (Brebisson), Germania 

 (Reinscii), Suecia (Cleve), Anglia (Cooke), Austria (Grunow), 

 America boreali (Wolle). — Adest quoque species homonima et 

 niihi valde incerta h. e. Staurastrum asperum Perty Kl. Lebensf. 

 p. 210, t. XVI, f. 31, Rabenh. Fl. Eur. Algar. III, p. 221 ita de- 

 scripta: a vertice quinquoradiatum, radiis trilobis, lobis abbrevip,- 

 tis, truncatis, medio elongato, bicuspidato. In monte S. Gotthardi 

 Helvetire. — Diam. 28 u. 



111. Staurastrum maamense Archer in Micr. Journ. IX, 1869, p. 200, 2S39 

 Cooke Brit. Desm. p. 155, Slaurasirum pseudocrenatum Lund. 

 Desm. Suec. p. 65, t. 4, f. 4. — Submediocre, quarta fero parte 

 longius quam latius, subovalo, apice utroque subtruncatum, medio 

 profunde constrictum, sinu lineari, angustissimo; somicellulis sub- 

 semicircularibus, margine ventrali recti, laterali utroquo verrucis 

 truncato-emarginatis nonnullis subcrenato, dorso obsoleto eroso, 

 angulis (inferioribus) subtruncatis; a vertice visis trigoniis, lateri- 

 bus leviter retusis, angulis late subtruncatis, granulis ternis in- 

 structis. 



Jlab. ad (cBergsbruuna)) in Uplandia ef ad «Rappe)) in Smo- 

 landia Sueciao (Lttndell), in Norvegia (Nordstedt), Britannia (Ar- 

 CHER, Cooke). — Dimens. 38-42^30-35, latit. isthrai 10. ^. Pro- 

 ximum est Siaurasiro crenaio Bailey quod differt emarginatura 

 modiana ampla, rotundata et semicellulis e basi cuneata flabelli- 

 forniibus. 



112. Staurastrum cornutum Archer in Journ. Dubl. Micr. Club IV, 2840 

 p. 16, Cooke Brit. Desm. p. 190 nec Wolle ! — Minutum, Siau- 

 rasiro maamcnsi Arch. simile, cornibus pluribus, gracilibus, sub- 

 inde furcatis, plus minus difformibus, crenis in margine semicellu- 

 larum minoribus niinus conspicuis. 



Ilab. \\\ (( Connomara)) Britannia) (Arciier). 



113. Staurastrum gemelliparum Nordst. Desm. Bras. p. 230, t. IV, 2?n 

 f. 54, Hedwigia 1870, pag. 187. — Parvum, circiter tam longum 

 quam latum, margine exterioro prominentiis furcatis instructum; 



