162 Rhodora [AucusT 
elements in the Sarek Mountains, as Chroococcus turgidus, Meris- 
mopedia glauca, Nostoc commune, Synechococcus aeruginosus, T oly- 
pothrix lanata and Hydrurus foetidus. In some cases it seems that 
somewhat different species fill corresponding places: Gloeocapsa 
magna in British Columbia seems to replace G. sanguinea in the Sarek 
Mountains, Seytonema myochrous in large part replaces S. mirabile 
and Batrachospermum moniliforme, B. vagum keratophytum. On the 
other hand some of the algal curiosities are common to both districts: 
Prasiola fluviatilis, Pediastrum tricornutum alpinum. 
The following are the species found in 1923: 
MYXOPHYCEAE 
AMPHITHRIX JANTHINA (Mont.) B. & F. Forming a dark reddish 
coating on rocks in Cafion Creek in the forest and in alpine rivulets 
near the sourct of Grizzly Creek. Locally abundant. 
ANABAENA AFFINIS HOLSATICA Lemm.? Rivulet near summit of 
Prairie Mountain. Scarce 
ANABAENA FLOS-AQUAE (Lyngb.) Bréb. In parkland pools of the 
Canon Creek valley and in a rivulet near the summit of Frairie 
Mountain. Scarce 
ANABAENA INAEQUALIS (Ktz.) B. & F. In pools and among wet 
moss by streams, Cañon Creek and on Prairie Mountain. Frequent. 
ANABAENA OSCILLARIOIDES Bory. In pools and streams, Prairie 
Mountain. Scarce. 
APHANOCAPSA GREVILLEI (Hass.) Rich. Pools, parkland of Cañon 
Creek. 
APHANOTHECE PALLIDA (Ktz.) Rabenh. Generally distributed; 
Cafion and Spillamacheen watersheds. 
APHANOTHECE SAXICOLA Naeg. Pools, parkland; Prairie Mountain 
Cafion Creek and Spillamacheen valleys. Scarce. 
CALOTHRIX PARIETINA (Naeg.) Thuret. Generally distributed; 
Cafion, Grizzly and Spillamacheen watersheds. 
CHAMAESIPHON FUSCUM (Rost.) Hansg. With Amphithrix on rocks 
in rivulet near head of Grizzly Creek. 
Curoococcus Macrococcus (Ktz.) Rabenh.  Parkiand pools, 
Cafion Creek, scarce. 
Cunoococcus minutus (Ktz. Naeg. Generally distributed, 
Cañon and Spillamacheen watersheds. 
Cunoococcus TURGIDUS (Ktz.) Naeg, Generally distributed, 
