*1: In shallow
quick-flowing water on lip of small weir, slightly shaded by
trees and Prunus
laurocerasus scrub, Clowance, SW63, 1994, DTH 94-359
(BBSUK, DTH) (Blockeel 1996: 47). An older
record from vc1 (Land's End, Holmes 1906) was discounted
because no specimen was located (Paton 1969a:
743).
*2: Dozmary Pool,
Bodmin Moor, 1918, FR (BM) (Paton 1969a:
743).
Habitat notes from Cornwall are as follows.
Clowance: at lip of small weir, in quick-flowing shallow
water, slightly shaded by trees. Further upstream (just W. of
Crowan) larger plants approaching var. gracilis were found,
along with typical material of var. antipyretica. NW. of
Trevenna: on rocks in small quick-flowing stream, lightly
shaded by deciduous trees (with no other other submerged
macrophytes except sparse Chiloscyphus
polyanthos and Platyhypnidium
riparioides). Upper
Tamar Lake: small patch on
unshaded surface in inundation zone beside
reservoir.
Not seen c.fr.
