September, 1921.] 



The Canadian Field-Naturalist. 



113 



the evolution of green Algae and per- 

 haps of all plant life. 



Sub-family P^iacoteae. 



23. Phacotas spec, not determined. The 



same difficulties surround this genus 

 as above. 



Sub-family Volvoveae. 



24. Goniiim pectorale, Mull, in green scum 

 in vast numbers at bottom of slough, 

 :\[ay. 



25. Pnndorina mormn. Mull, common m 



sloughs. 



26. Eudorina elegans, Ehrenb., common in 



slough plankton. 



27. Volvox aureas (L) Ehrenb. This alga 

 was to be found in vast numbers in 

 the slough plankton during the latter 

 part of IVIay. 



Sub-order Tetrasporineae. 



Family Palmellaceae. 



Sub-family Tetrasporeae 



28. Tetraspora luhrico (Roth) Ag, on 

 .stones at the outlet of a small spring, 

 Summerland, May. 



Family Protococcaceae. 



29. Trochiscia aspera (Reinsch) Hansg., 

 common in plankton. 



Family Autosporaeeae. 

 Sub-family Oocysteae 



30. Ooctjstis soUfaruK Wittr., slough and 

 lake plankton. 



31. 0. crassa, Wittr., as above. 



32. Nephrocytium aghardlanum. Nag., 



from s(iueezings of a moss resembling 

 spliagninn. 



33. Tetracoccus hotryoides. West, lake 

 plankton, April. 



Sub-family, Selenastreae. 



34. 'Scenedesmus hijugatus, (Turp) Kutz., 



lake and slough plankton. 



35. S. qiiadricauda, (Turp.) Breb, as ab- 

 ove. 



36. Ankisfrodesmus setigurus (Schrod) 



West, slough plankton. 



Order 2. Siphon ales. 

 Family. Vaucheriaceae. 



38. V. geminata (Vauch) DC. Dog Lake 

 in ditches. Vaucheria grows in felty 

 masses like moss and may be recog- 

 nized from other algae with the naked 

 eye. 



Order 3. Siphonocladiales. 



Family Cladophoraceae. 



Sub-family Cladophoreae. 



89. 

 40. 



41. 

 42. 



43. 

 44. 



45. 



46. 

 46. 

 48. 

 49. 



50. 

 51 



52 



.)o 



54 



55 

 56 



( Indopho a c ispafa. Roth. Penticton 

 Creek, Sept. 



Sub-family Rhizoclonieae. 

 Bhizoclonium hieroglypMcum, (Roth) 

 Kutz. sloughs, also Marron Lake. 

 Order 6. Ulotrichales. 

 Family Ulotric)iaeeae. 

 Ulothrix zonata, (Web & Mohr) Kutz., 

 common, found in many stations at all 

 seasons. 



U. suhtilis, Kutz., Okanagan Falls, 

 Apr., growing on stones under water, 

 where current was swiftest about 12- 

 15 miles per hour. 



Family Microsporaceae. 

 Microspora tumidula, Hazen, Dog 

 Lake, entirely an American species. 

 M. stagnorum, (Kutz) Lagerh., com- 

 mon in pools more or less stagnant. 

 Family Chaetophoraeeae. 

 Sub-family Chaetophoreae. 

 Chaetophora pisiformis. (Roth) Ag. 

 growing on a floating board. Sloughs. 

 C. clegaiis (R;)tli) Ag. growing on a 

 dead stick, sloughs. 

 C. elegans (Roth) Ag. growing on a 

 zen. Dog Lake on a submerged log. 

 Draparmddia plumosa (Vaueh) Ag., 

 free floating Ok Lake. 

 Draparnuldia glomerata, (Vauch) Ag,, 

 on dead tule (Scirpus spec.) Pen 

 slougiis. 

 Myxovema tenne (Ag) Kutz., Ok Lake. 



Sub-family Microthamnieae. 

 Mi croih amnion Kutzingiannm, Nag., 

 on dead tule (Scirpus spec.) sloughs. 

 Division II. Akontae. 

 Order 1. Conjugatae. 

 Family Zygnemaceae. 

 Sub-family Mesocarpeae. 

 Mougeotia spec. This genus is quite 

 common, sterile filaments only. 



Sub-family Zygnemeae. 

 Zygiienid cricetorum (Kutz) Hansg., 

 in drying pond by Okanagan River. 

 Sub-family Spirogyreae. 

 . Spirogyra tenuissima, (Hass) Kutz., 



ponds Penticton Creek, May. 

 . S. inflaia (Vaueh) Rabenh., as above. 

 . S. nitada (Dill) Link., ditches Pentic- 

 ton, April. 



The family Zygnemaceae is perhaps 

 the most widely scattered and by far 

 the most noticeable of all the algae. 



