Flora of Scottish Lakes. 
83 
1909-10.] 
from the peat, and derived from the disintegration of the underlying 
rock. 
Typha angustifolia, L. V., VII. Of more restricted distribution than 
the last, but where it does occur it is usually in greater abundance 
and covers a considerable area of ground (figs. 84 and 85). 
Sparganium ramosum, Huds. ( = 8. erectum, L.). “I., II., III.,” V., VI., 
VII. More abundant in Area VII. than elsewhere, chiefly on the rich 
boggy margins of lowland lochs. Dwarf varieties occur as well as 
the large normal form. 
Sparganium simplex, Huds. V., VII. In similar situations to the last 
species, but usually much less abundant. Weak forms with elongated 
floating leaves also occur, usually in a foot or so of water. The 
var. longissimum, Fries , occurs sparingly at Loch Fitty. 
Sparganium natans, L. ( — 8. affine, Schnizl.). “I.,” IV., V., VI., VII. 
Rather frequent in IV., scarce elsewhere. Chiefly in peaty lochs of 
moderate elevation (ante, fig. 34). 
Sparganium minimum, Fries. " I.,” TV., VI. Generally scarce, and 
mostly confined to the hill lochs. I have previously remarked (ante, 
p. 977) upon the variable nature of this genus. It seems to me that 
the most degenerate form of S. minimum and the most robust 
condition of S. ramosum are connected by numerous intermediates. 
Perhaps experimental culture on the right lines with S. ramosum 
would produce all the other forms. 
LEMNACEiE. 
Lemna trisulca, L. VII. Rarely found in the lochs, and only in those 
having a luxuriant marginal vegetation and non-peaty water, well 
sheltered by trees. It is very abundant in Kilconquhar Loch. 
Lemna minor, L. VII. Remarks same as to the preceding species, 
but more frequently met with in the lochs. It is a common plant 
in ditches, etc., in all the Areas below about 500 feet elevation. 
POTAMOGETONACEiE. 
Zannichellia palustris, L., var. brachystemon (Gay). VII. Rare in the 
lochs as a rule, but extremely abundant in Kilconquhar Loch. 
Potamogeton natans, L. “ I., II., III.,” IV., V., VI., VII. Abundant 
everywhere. It seems to me that this plant and its congener P. 
polygonifolius run into one another somewhat, although the two 
species can usually be easily distinguished by the characters ex- 
hibited by leaf, fruit, etc. The typical P. natans is most often 
