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



Order— CON JUGATiE. 

 Family — Zygnemaceae. 



Sub-Family— Mesocarpe^. 



50. Mougeotia scalaris Hass. 



Peiitlands near Loganlee ; Glencorse ; Bavelaw ; Elf Loch. May- 

 July. 



51. i/. mridis (Kiitz.) Wittr. 



Bavelaw Moor, with spores in April and May. 



52. M. -parvula Hass. 



Bavelaw Moor, with spores in April and May. 



Mougeotia species are very common, especially in the Pentlands, 

 but only fertile species can be determined exactly, while in 

 most cases only sterile filaments can be found. This remark 

 holds good for nearly all the members of the Order Con jugatae, 

 with the exception of the Family Desmidiaceae. 



Sub-Family — Zygnemej^:. 



53. Zygnema ericetorum (Kiitz.) Hansg. 



Common in peaty places in the Pentlands, especially on Bavelaw 

 Moor, at all seasons ; also Elf Loch. 



54. Z. leiospermum De Bary. 



Bavelaw Moor, July ; Elf Loch, August. 



55. Z. parvulum Cooke. 



Pentlands near Loganlee, in ditch. June. 



56. Z. anomalum (Hass.) Cooke. 



Bavelaw Moor. May, June. 



57. Z. Ralfsii (Hass.) De Bary { = Zygogoniuvi Rolf six). 



Ditch near Harelaw Eeservoir. April, May. 

 Zygnema species are very common in the Pentlands, but generally 

 only sterile filaments are found. 



58. Spirogyra longata (Yauch.) Wittr. 



Ditch near Granton. April. 



59. S. tenuissima (Hass.) Kiitz. 



This is the smallest of all the species of Spirogyra, and seems to 

 be frequent. It was found fruiting on Bavelaw Moor in 

 April, near Harelaw Eeservoir in May, and Elf Loch in July. 



60. S. injiata (Yaucb.) Babenh. 



Bavelaw Moor. May. 



61. S. TTeSen (Klitz.) Kirchn. 



Balerno, in pond. April, May. 



62. S. Grevilleana (Hass.) Klitz. 



Elf Loch. May. 



The genus Spirogyra is well represented in our district, but only 

 five species could be identified with absolute certainty, as 



