Conjugataj, DesmidiaceaB, Gymnozyga. 797 



Ilab. in fossis, stagnis Boru.ssiaj, Holsatiie, Silosi u e. g. prope 

 aElmshorn)) in Gerinania (Rabeniiorst), in Hibernia (Archer), iii 

 Suecia (Lundell), in Boliomia (CoRUA, Hansgirg), in Dania (Ja- 

 COBsen), in America boreali (Wolle); ad uOmatangi)) Nova) Ze- 

 landije (S. Berggren), in Japonia (RoY, Bisset) et Birmania Asiie 

 (Joshua). — Specimiua novo-zeiandica praebent cellulas (sine pro- 

 cess.) 14,5-18 a. longas, 15-18 a. latas, isthmum circ. 3 ■j.. latum. 



5. Onychonema? serratum (Bail.) Hansg. Prodr. pag. 171, nota 1, i«99 

 Sphcvrozosr/ia serralum Bail. Micr. Obs. in Smith. contrib. to Kno- 

 wledge 1850, pag. 37, n. 10, tab. 1, fig. 14, Wolie Desm. U. S. 



p. 30, t. IV, f. 7, Spondy losiwn serralum Archer in Pritch. Inf. 

 loc. cit. — Cellulis 22-33 y-. diam., diametro dupio-brevioribus, 

 profunde et acute excisis, arcte conjunctis; lobis utrinque cuspi- 

 datis, paulum conniventibus; cellulis per duo processus breves, glan- 

 duliformes connexis; vagina gelatinosa crassa. 



Hab. in America Carolina, Georgia, Florida (Bailey), New Jer- 

 sey, Pennsylvania aliisque locis Amer. bor. (Wolle). 



6. Onychonema? paradoxum (Delp.) Hansg. Prodr. pag. 171, nota 1, i90o 

 Xanlliidiaslruin paradoxum Delp. Specim. Desm. subalp. p. 08, 



t. IH, f. 27-33. — Filamentis compressis, subcontortis, plerumquo 

 nudis; cellulis medio valde constrictis, e fronte suborbiculatis, sub- 

 hexagoniis, e facie terminali globoso-didymis; semicellulis oblongo- 

 reniformibus, ambitu subtrigonis, aculeatis, aculeis terminalibus 

 solitariis convergentibus, dorsualibus rectis «quidistantibus, abor- 

 tivis; endochromate e chlorophoris 4 laminaribus cum pyrenoide * 

 pro qualibet semicellula. 



Ilab. in lacu Candiano Italiae borealis (J, B. Delponte). 



GYMNOZYGA Ehrenb. [1840] in Berl. Monatsber. 1840 p. 212 (Etym. 

 gymnos nudus et zygon jugum), Jacobs. [1874] Apercu pag. 213, 

 Hansg. Prodr. pag. 169, Bambusina Kuetz. [1845] Phyc. gerni. 

 p. 140, Rabenh. Fl. Eur. Algar. III, p. 152, Wolle Desm. U. S. 

 p. 24, Didymoprii sp. Grev., Besmidii sp. Ralfs. — Cellula^ oblon- 

 go-doliiformes, medio arcte constricta^, carinis duabus annuliformi- 

 bus limitatve, sursum deorsumque bidentatye, in filamenta articu- 

 lata, longiuscula, sine tubo gelatinoso, nodosa dense conjutictai; 

 chlorophora 6-10-radiata in unaquaque semicellula; zygota glo- 

 bosa, ellipsoidea vel oblongo-ovata; fructificatio ut in Hyalolheca. 



1. Gymnozyga moniliformis Ehrenb. in Monatsber. Berl. Akad. 1840, looi 



