1904 - 5 .] 
Flora of Scottish Lakes. 
979 
form in L. Ashie. II. Extremely abundant in deep water. 
I have seen these at Lismore growing in 24 ft. of water and 
yet producing their flowmrs above the surface. 
Potamogeton pusillus, L. I. Only observed in two lakes. 
II. Abundant. 
Potamogeton pusillus, var. tenuissimus, M. fy K. I. Only 
observed at L. Meiklie in 8-10 ft. of water. II. In water 
about 12 ft. deep. Merely a deep water form. 
Potamogeton filiformis, Pers. II. In shallow water. 
I have not observed P. densus, L., nor P. pectinatus, L., in 
these districts. It may interest Edinburgh botanists to 
know that P. pectinatus, L., produces abundantly its hiber- 
nating shoots in Duddingston Loch. 
CYPERACEiE. 
Heleocharis palustris, Br. I., II., III. Abundant everywhere. 
1 found an interesting form on a sand-bank, on the shore of 
L. Ness. In order that it might not be buried too deeply 
by the growing sand-bank, the rhizome had discarded the 
diageotropic habit and assumed negative geotropism. 
Scirpus lacustris, L. I., II., III. Generally distributed and 
abundant in lowland lakes under 1000 ft. elevation. I 
have seen the stems of these 14 ft. long — 6 ft. above the 
surface of water, 8 ft. deep. When cut off near the rhizome 
such large specimens shoot up out of the water 3 or 4 ft., 
owing to the air contained in the intercellulars. The 
long linear grass-like leaves I have only seen in water 
3-8 ft. deep. 
Eriophorum vaginatum, L. I. Abundant about the peaty 
shores of hill lochs. 
Eriophorum polystachion, L. I. Abundant about the peaty 
shores of lochs, chiefly lowland, but also quite common 
about mountain lochs. II. Small specimens. 
Carex dioica, L. I. Shores of mountain lochs ; not common. 
Carex elata, All. I. A carpeting form with diageotropic 
rhizomes in wet places, and a csespitose form with 
negative geotropic rhizomes forming tussocks in water 
2 or 3 ft. deep. Inchnacardoch Bay, L. Ness. 
