ISOKTES.— LYCOPODIUM. 
535 
1. IsoETES. Linn. Quilhvort. 
* No persistent leaf-bases. Caps, not wholly covered by the 
membranous edge of the pouch. Back of swollen leaf -base 
smooth. — Aquatic. 
1. /. lacus'tris (L.) ; 1. subulate roundish-quadrangular with 
4 longitudinal jointed tubes upright dark green, lanier spores 
hlimtly tuberded rather mealy, tubercles overtopped by the 
valve-edges. — E. B. 1084. //. 55. R. vii. 1. — Corm with 
longitudinal furrows. L. slender, broad and Hat at the base, 
but elsewhere between cylindrical and quadrangular, 2 — 6 in. 
long. — 1. Morei (Moore) is a form with exceedingly long leaves. 
J. of B. xyi. 1. 199.— Usually cajspitose on the sandy and stony 
bottom of lakes and pools in hilly districts. P. VI. E. S. I. 
2. /. echinos'pora (Dur. 1) ; 1. subulate roundish-quadrangular 
with 4 longitudinal jointed tubes patent pale green, i^arr/o- sjyores 
very acutely tuberded, tubercles overtopping the valve-edges. — 
J. of B. i. t. 1. — Much like Sp. 1. Corm not furrowed. L. 
turning yellow, less rigid, flattened and dilated below. Spores 
covered with long acute spine-like tubercles, not mealy. — 
Usually solitary on the muddy bottom of pools and lakes in 
hilly districts. Llanberis, N. Wales. Loch of Park near Aber- 
deen. Ben Voirlich, Dumbartonshire. [Near Tongue, Sutueri.] 
Gap of Dunloe, Kerry. [Gaiway. Mayo.] P. VI. E. S. I. 
** Corm more or less covered by the persistent hardened leaf- 
bases. Caps, wholly covered by the membranous edge 
of the pouch. Swollen leaf-base with a central longi- 
tudinal rugose band on the back. — Terrestrial. 
[/. Hys'trix (Bory) ; 1. filiform plane-convex obscurely tubu- 
lar, persistent l.-bases short blackish each with 2 long horns and 
an interm. tooth, larger spores white and bluntly tuberded. — 
/. Duricei H. F. 56. — Corm small, rarely if ever quite naked. 
L. very slender, ultimately very much enlarged at the base 
to enclose the capsule, 1 — 2 in. long, annual. — Dampish sandy 
and stony places. L'Ancresse, Guernsey. J/r G. Wolsey. 
[Alflerney. Mr E. D. Marquand.] P. V. VI.] 
2. Lycopo'dium Linn. em. Spring. Club-moss. 
■* St, creeping, prostrate. Caps in term, spikes, tvith bractlike 
leaves. Lepidotis Beauv. 
1. L. clavdtuiit (L.); 1. scattered imbricate incurved hair- 
pointed, spikes stalked 2 or 3 together cylindrical, scales ovate- 
