430 101. LYCOPODIACE^. 



I. PiLULARiA. Involucres solitary, nearly sessile, globose, 

 coriaceous, 4-celled. Cells containing bodies of two kinds ; 

 granules, and membranes containing minute grains. 



1 . PiLTJLARiA Linn. Pillwort. 



1. P. globuUfera {L.).—E. B. 521. N. 393.— Rhizome slender, 

 creeping, producing leaves and roots at regular intervals. L. very 

 slender, erect. Inv. slightly stalked, axillary, nearly spherical, 

 hairy. — Margins of ponds and lakes. P. 



Order CI. LYCOPODIACE^. 



Leafy plants with simple imbricated leaves ; or stemless with 

 erect subulate leaves. Pructification of axillary sessile capsules 

 with 2 or 3 valves and no ring, including minute powdery matter 

 or sporules. 



* Capsules not opening. 



1. IsoETES. Fructification inclosed within the swollen base 

 of the leaves. Sporules of two kinds attached to flhform 

 receptacles. 



** Capsules bursting. 



2. Lycopodidm. Caps. 1-celled, 2-valved, containing pow- 

 der; or 3-valved, containing 1 — 4 granules. 



1. IsoETES Linn. Quillwort. 



1. I. lacustris (L.) ; 1. subulate roundish-quadrangular with 4 

 longitudinal jointed tubes.— ^. B. 1084. N. 381. R. vii. t. 1. 

 — Rhizome a blunt tuber. L. slender, broad and flat at the base, 

 but elsewhere between cylindrical and quadrangular. — Bottom of 

 lakes and ponds in hilly districts. P. VI. 



2. Lycopodium Linn. Club-moss. 

 * Caps, all \-celled. Sporules like powder. Lycopodium Koch. 



1. L. clavatum (L.) ; 1. scattered incurved with a filamentous 

 point, spikes stalked 2 or 3 together cylindrical, scales ovate- 

 triangular membranous finely incise-serrate. — E. B. 224. N. 353. 

 — -St. prostrate, long. Branches short, ascending. Spikes on 

 long stalks, pale yellow. Scales on the stalks irregularly disposed 

 in whorls.— Heaths. P. VII. VIII. Common Club-moss. 



2. L. annoiinum (L.) ; 1. scattered lanceolate mucronate ser- 

 rulate, tpikes sessile solitary terminal, scales roundish with an 



