112 



The Canadian Field-Naturalist. 



[Vol. XXXV. 



A CONTRIBUTION TO THE ALGAE FLORA OF THE OKANAGAN 



(BRITISH COLUMBIA). 



By E. D. SiSMEY. 



CLASS MYXOPHYCEAE. 

 Order I. Coccogoneae. 



1. Dactylococcopsis montana W. & G. S. 



West, in lake plankton. 



2. Merisfuopodia elegans Braun, in ditch- 



es, April. 



3. Aphanocapsa spec, not determined. 



Order II. Hormogoneae. 

 Family. Scytonemaceae. 



4. Scytonema myochros (Dillwyn) Ag- 



ardli, growing on rocks moistened 

 by water at Peachland, May. 

 Family. Nostoeaceae. 



5. Nostoc depressum. Wood, Penticton 



Creek flnme, May. 



6. N. microscopicum, Carmicheal, from 



squeezings of a water moss resem- 

 bling Sp^iagnum, June. 



7. Nodulnria spiimigena var. genuina, 



Bornet & Flaihault, in ponds Indian 

 Re.serve, May. 



8. N. Harveyana (Thwaites) Thiiret, in 



sloughs. Pen, May. 



9. Avahaeiia inequalis (Kutz), Bornet & 



Flahault, small pond Indian Re- 

 serve, June. 

 .10. A. flosaquae, Breh, free floating in 

 sloughs. 

 Family. Oscillatoriaceae. 



11. Phormidium autuninale (Ag) Gora, on 



wet rocks at Peachland, B. C, May. 



12. Oscillatoria limosa, Ag. in small pond 



Dog Lake. 



13. 0. formosa, Bory, Penticton sloughs. 



14. 0. geminata, Menegh, outlet of a sep- 



tic tank. 



15. O. (tyjuv dii, Gom, in pond Dog Lake 



Avith 0. princeps. 



16. 0. pri))ccps, Vaueh, free floating balls 



in small pond Dog Lake. This huge 

 Alga is uncommon. 



17. (). horyana, Bory, at the outlet of a 



septic tank. 



18. Spiridina major, Kutz, Penticton Creek 



in ponds. 



19. N. Hieueg1ii)iia)ia. Zeiiard, moss squeez- 



ings. 



Family Rivulariaceae. 



20. Rividaria pisum, Ag, in water moss, 



Dog Lake ; also on weeds. Ok Lake. 



21. Calothrix parasitica (Chauvin), Thur- 

 et, growing on a floating log. Dog 

 Lake. 



Peridinieae. I have omitted this 

 group from this list not only because 

 I have no literature on the subject, 

 but because some authorities group 

 them among the Flagellates. What- 

 ever view is taken tjie Peridinieae 

 may be left out without spoiling the 

 general balance of the list. They are 

 naturally a subject for a special study. 

 The Peridinieae are of considerable 

 economic importance as they are large 

 storers of reserve food material, thus 

 forming a basic food supply for count- 

 less small organisms. 



. Bacillarieae. The Diatoms are 

 universally acknowledged to be a sub- 

 ject for a special study. As some 

 12,000 species (including fossils) have 

 now been described it is difficult to 

 attempt to enumerate species in a list 

 of this kind. At the same time, as 

 Diatoms usually form a considerable 

 proportion of the plankton gatherings 

 I include several genera wit;h some 

 specific identifications in my plank- 

 ton notes of Okanagan Lake. In this 

 respect the diatoms are of special in- 

 terest in establishing periodicity 

 curves, and also, en passont, a great 

 many points of biological interest may 

 be ol)served. 



CLASS CHLOROPHYCEAE. 



Division I. Isokontae. 



Order I. Protococcai.es. 



Family. Volvocaceae. 



Sub-family. Chlamydompnadeae 



22. Chlamynomonas spec, in slough plank- 

 ton. Identification of species a mat- 

 ter of great difficulty, there being 

 a difference of opinion among the best 

 authorities. The Genus Chlamydo- 

 monas occupies a position of great in- 

 terest among the green algae. It is 

 looked upon as the starting point in 



