358 The Alga- Flora of Mid- Lothian. [Sess. 



Class III.— CHLOROPHYCE^. 

 Order— CEDOGONIALES. 



12. (Edogonium Borisianum (Le CI.) Wittr. 



Bavelaw Moor. June. 



13. CE!. decipiens Wittr. 



Bavelaw Moor. June. 



Although there seems to be a great number of species of this 

 genus growing in this county, I have only been able to find 

 two of them in a fructiferous condition. Sterile species are 

 very common in all the lochs, ponds, and ditches. Asexual 

 reproduction can often be observed, but is useless for deter- 

 mining species. The other genus of this Order, Bulhochoete, 

 I have found several times, but never in fruit, and therefore 

 could not determine the species. 



Order— CH^TOPHORALES. 

 Family — Coleochaetaceae. 



14. Coleochcete scutata Breb. 



Elf Loch. July. 



15. C. soluta Pringsh. 



Duddingston Loch. August. 



Family — Herposteiraeeae. 



16. Herposteiron confervicola Nag. { = Aphanochcete repens A. Br.) 



Very common, growing as an epiphyte on Cladophora, (Edogonium, 

 and phanerogams. Marlpit at Davidson's Mains ; Elf Loch ; 

 Bavelaw Moor ; reservoir near Balerno. April- June. 



Family — Ulotrieliaceae. 



17. Ulothrix zorwbta (Web. et Mohr) Kiitz. 



This Alga is one of the commonest and in many ways most 

 interesting species, owing to the ease with which it produces 

 zoospores. It is found only in running water, and mainly 

 in the early part of the year. I have found it as early as 

 January, but in greater abundance in March and April, — only 

 on two occasions in July and August. It grows in great 

 profusion among stones on the sides of Glen corse and 

 Loganlee Reservoirs ; also in many troughs, and in the 

 Water of Leith from Balerno down to Colinton. In early 

 spring I found it regularly in the pond at Inverleith Park, but 

 it disappears soon, and is replaced by Cladophora after April. 

 The thickness of the filaments varies from 15 /x up to 77 /u. 



