360 The Alga-Flora of Mid-Lothian, [Sess. 



Family — TrentepohliaceaB. 



32. Trentepohlia aurea Mart. 



This is one of the few Algse able to thrive in nearly dry places. It 

 seems to be fairly abundant around Edinburgh, forming 

 orange-red patches on walls and rock-faces. In the Pentland 

 Hills I found it on the rocks of Caerketton and Allermuir. 

 It grows in great abundance on the wall of Dalkeith Park 

 near Newbattle, and is very conspicuous in Malleny Glen on 

 the walls of the overflow of Harelaw Eeservoir. 



33. T. odorata (Ag.) Wittr. {=T.vmhrina (Kiitz.) Born.) 



Forming orange-red patches on the bark of a sycamore, and also 

 on a beech, Balerno and Swanston. June, July. 



Order— UIi VALES. 

 Family — Ulvaceae. 



34. Monostroma bullosa (Eoth) Wittr. 



Duddingston Loch. April. 



35. Bnteromorpha intestinalts (L.) Itink. 



This is the only freshwater species of the genus, and is very 

 common in salt and brackish water on our coast. It was 

 found also in the following purely freshwater localities, 

 growing in great profusion, during July and August : Pond 

 in Inverleith Park ; Duddingston Loch ; Dunsapie Loch ; 

 Union Canal near Craiglockhart. 



Order— SCHIZOGONIALES. 



Family — Prasiolaceae. 



36. Prasiola parietina (Vauch.) Wille ( = Schizogonium murale Kiitz. and 



Hormidium parietinum Kiitz.) 

 This Algse is, next to Fleurococcus, our commonest species, and to 

 be found everywhere, forming a green glossy film on walls, 

 stones, planks, and trees, and also on bare patches of lawns. 

 The light-green is turned to a dark colour in wet weather. At 

 all seasons. 



37. P. crispa (Lightf.) Menegh. {= Schizogonium crispum (L.) Gay, 



Hormidium murale Kiitz., and TJlothrix radicans Kiitz.) 

 This species I have found only twice near Edinburgh, — in an old 

 quarry near Granton, and on wet soil near Musselburgh. 



Order— MICROSPOKALES. 

 Family — Microsporaceae. 



38. Microspora amoeana (Kiitz.) Lagerh. 



In running water, burn near Cramond. April. 



