157 
Pediastrum undulatum (Wille) Boldt. 
Syn. P. Boryanum (Turp.) Menegk. £. undulatum 
Wille Ferskv. alg fr. Nov. Semlj. p. 28. 
Coenobiis suborbicularibus vel oblongis, continuis, 
e cellulis usque ad 128 et 256 (!) compositis; cellu- 
larum strato simplici; cellulis perifericis bilobis, lobis 
cornutis; cellulis centralibus arctissime conjunctis, irregu- 
lariter undulatis ; omnium membraua punctata. Figura 1. 
Diam. max. coenob. 230 — 259 diain. min; 
coenob. 180 — 210 ju ; Lat. cell, marginal. 22 — 17 
//. Long. cell, marginal sine corn. 12 /<; long. corn. 
12 ju. 
Godtbaab (Tärnkolmen), ubi cl. Th. M. Fries 
legit 9 YI 1871. 
Pediastrum rotula A. Br. Disp. cell. 1 + 7 = 8; 
Diam. coenob. 32,4 /u. Kung Oskars hamn. 
ß eniarginatum A. Br. Disp. cell. 7 + 1 — 8; 
Diam. coenob. c. 28,8 fi. Friedriclisthal. 
Pediastrum vagum Kim. Coenob. e cell. 32 com- 
pos. Sofiehamn. 
Ophiocytium parvulum (Perty) A. Br. Lat. fil. 
4,8 u. Ivigtut. 
