De Desmidiaceis. ' 27 



8. C. TETRAOPHTHALMUM (Kütz.) Bréb. (in Ralfs Brit. Desmitl. pag-, 98, 



tab. XVII, fig. 11; Ileterocm-pella tetraophthalmn Kütz. Synops. 

 Diät, in Liiiiiava 1833, pag-. 597, fig. 87, sec. Ralfs). 



Forma verrucis minoribus, in apice semicellulse niillis, membrana dense 

 granulato-punctata. 



Hab. in Sniolandia ad Unnaryd, Femsjö, Rappe et Wirestorp. 



9. C. Brebissünii Menegh. (Synops. pag. 219). 

 Nuclei amylacei bini. 



Long. 0,0022' =56 /^; Lat. 0,002'=51 ^; Lat. istlimi 0,oooo3' = 16 /^. 



Hab. in "Norby skog" et "Kungsparken" prope Upsaliam , ad 

 Bergsbrunna in Uplandia. In Ostrogothia ad Bolltorp. In Sniolandia ad 

 Huseby (Cleve), Rappe, Unnaryd, Femsjö et Wirestorp. 



Forma Gallica, a Menec4HIni 1. c. descripta, qure ab Aiiglica, a cl. Ralfs 

 (Brit. Desniid. pag. 100, tab. XVI, fig. 3) delineata, "celhdis" (= seiiiicellulis) "a la- 

 tere formam trapezii prse se ferentibus, superficie graiiulato-margaritacea" (vide Me- 

 negh. Synops. 1. c!) nomiihil differre videtur, apiul nos admoduiu vulgaris est et in 

 formam, semicellulis subtrapezicis membranaque miiricibus conicis ornata ad Angli- 

 cam prope accedentem, formis intermediis nonnumquani transit. 



10. C. LTngerianum Näg. (Euasfrum (Cosra.) Uni/erianum Nägeli Gatt, 

 einzell. Alg. pag. 120, tab. VII, A, fig. 10). 



Hab. in "Kungsparken" et "Norby skog" prope Upsaliam, ad Bergs- 

 brunna et Noor in Uplandia. 



**11. C. TRACHYPLEURUM nOV. Sp. 



C. mediocre, diametro quarta parte longius, profimdc cunstrictura, 

 sinu intimo lineari angusto, extremo anipliato; semicellulse subreniformes, 

 medio dorso truncatse et nudœ, iidra marginem exteriorem et in ipso mar- 

 gine utroque laterali verrucis acute conicis in series peripliericas subdispo- 

 sitis munit»*), in centro verrucis 7 (6 periphericis, 1 centrali) majoribus 

 depressis et inter verrucas punctis nonnullis rufescentibus ornatic; a vertice 

 visse elliptic^;, medio utrimque verrucis ternis truncatis ornatte, intra mar- 

 ginem et in utroque polo verrucis acute conicis instructee, in centro nudee; 

 a latere visse circulares. Membrana subtiliter punctata, fascia connexiva 

 minus distincta Latitudo istbmi quadra ns diametri longitudinalis corporis. 

 Crassitudo circiter duîe partes latitudinis cellulse. Nuclei amylacei bini. 



Long. 0,00197" = 50 ^.; Lat. O,ûoi.08" = 40 /*; Lat. istiimi 0,ooo48' 

 = 12,3 ^; Crass. 0,oou' = 28 ^. — Tab. II, fig. 12. 



*) Unde ductum est nomeu specificum (rQa^ik = asper; ttAscjj« = latus). 



