56 P. M. LUNDELL, 



Zygosporœ globosse, aculeis simplicibus loiigis mimitse. 



Hah. in "Lassby backar" prope Upsaliam (c. zygosp.) et ad Bergs- 

 bruniia in Uplandia. In Smolandia ad Huseby (Cleve), Unnaryd, Femsjö 

 et Rappe. 



/3. MAJOR (Xanthidium octocorne /3. major Ralfs 1. c. fig. 2 f — i). 



Hah. ad Bergsbrnnna in uplandia. Ad Bolltorp in Ostrogotliia. 



Hffic species, qiuim massam cbloropliyllaceam, ui fallimur, centralem (sicut 

 ceterse hujus geueris species) habeat, inter Xanthidia collocauda non est. 



V. s T AURA s TRUM Meyen. 



(Nova acta vol. XIV, II, pag. 777, 1829, sec. Aut.; Ralfs Brit. Desmid. pag. 119). 



A. STAURASTEUM (sensu strict.) nov. subgen. {^gw. Staurastnim 



De Bary Conjugat. pag. 71). 



Massa cbloropliyllacea centralis, in laminas e nucleo amjdaceo 

 unico centrali radiantes, angulum vel radium cellnl^e quemque (utrumque) 

 versus geminas convergentes, formata. 



1. S. MUTICUM Bréb. (in Ralfs Brit. Desmid. pag. 125, tab. XXI, fig. 

 4; Binatella mutica Bréb. Alg. Falaise pag. 57, tab. VIII, 

 sec. Ralfs). 



Hah. ad Bergsbrunua in Uplandia. Ad Carlberg prope Holmiam 

 (Cleve). Ad Unnaryd, Femsjö et Wirestorp in Smolandia. Ad Bolltorp 

 in Ostrogothia. 



Forma minor (Phijcastrmn depressinn Nägeli Gatt, einzell. Alg. pag. 

 126, tab. VIII A, fig. 1). 



Hah. ad Bergsbrunna in Uplandia. 



*2. S. COARCTATUM Bréb. (Liste pag. 144, tab. I, fig. 29). 



Forma fere duplo minor, semicellulis utroque polo angiistato-obtusis. 

 Membrana in angulis subtiliter punctata. 



Long. 0,00083" = 21 /^; Lat. O,00079-85" = 20 — 21 ^.; Lat. isthmi 



0,0002" =3 5 yit. 



Hah. ad Bergsbrunna in L^plandia. 



3. S. ORBICULARE (Ehreub.) Ralfs (Brit. Desmid. pag. 125, tab. XXI, 

 fig. 5; Desmidium? orhicidare Ehrenb. Abb. d. Berl. Ak. 1833, 

 pag. 292). 



