468 LYCOPODIACEiE. 



vessels ; or stemless plants, with erect subulate leaves and a 

 solid corm. ^ 



1. LYCOPODIUM. Linn.— Cluh Moss. 



(From the Greek Xvkoj, a wolf, and tovj , iro6oi, afoot ; on account of a supposed 

 resemblance in the appearance of some species.) 



Spore-cases all of one kind, 1 -celled, reniforra, somewhat 

 didymous, opening transversely at the apex or rarely at the 

 base. 



* Spore-cases m spikes. 

 f Spikes pedunculate. 



1. L. clavatum Linn. : stem creeping, with ascending branches ; leaves 

 scattered, numerous, subulate-linear, incurved and hair-pointed; spikes 

 mostly in pairs, cylindric, pedunculate ; scales ovate, acuminate, erosely 

 denticulate. L. tristachyum Pursh. ? L. integrifolium Goldie. 



Dry woods. Can. to Del. W. to Mich. July. %. — Stem closely trailing 

 on the ground, several feet long, rooting and throwing up fertile branches 2 — 6 

 inches long. Leaves 3 — 4 lines long, light green, entire or minutely denticulate. 

 Spikes usually in pairs, sometimes 1, rarely 3 or 4, yellowish, erect. Peduncles 

 2 — 5 inches long. Common Clvb-moss. 



2. L. complanalum Linn. : stem trailing ; branches erect or ascending, 

 dichotomously and pedately subdivided, with the branchlets flattened and 

 spreading ; leaves 4-rowed, the marginal ones connate and diverging at the 

 apex, the middle rows distinct and appressed ; spikes 2 — 4, cylindric, on a 

 long common peduncle. 



Woods and thickets. Arct. Amer. to Car. ; common. July. %. — Stem 2—8 

 feet long, procumbent or sometimes shorter and nearly erect, variously branched. 

 Leaves short, 4-rowed, those on each margin broad at the base and somewhat 

 spreading, those of the middle row smaller and closely pressed to the flattened 

 sides of the stem. Spikes about an inch long. Flattened Clvb-moss. 



ft Spikes sessile. 



3. L. inundatum Linn. : stem prostrate, creeping ; fertile branches soli- 

 tary, erect, with a single oblong sessile and leafy spike at the extremity : 

 leaves linear, scattered, acute, entire or sparingly denticulate, curved up- 

 wards, L. Caroiinianum Big. 



var. alopecuroides Tuckerman : fertile branches elongated ; leaves linear- 

 subulate, sparingly ciliate-denticulate at the base. L. alopecuroides Linn. 



Swamps and wet sandy margins of ponds. Hudson's Bay to Flor. July, 

 Aug. %. — Stem long, creeping close to the ground, yellowish-green. Fertile 

 brandies subradical, 2—10 inches high. Sterile branches short, flaccid. Leaves 

 varying from entire to conspicuously denticulate. Spikes 6 lines to an inch or . 

 'Hore long, leafy. Marsh Club-moss. 



4. L. annotinum Linn. : stem creeping, very branching ; branches 

 iscending, 2 — 3-forked, the branchlets simple; leaves in about 5 rows, 

 •mear-lanceolate, mucronate, serrulate at the apex, spreading ; spike soU- 

 efiry, oblong-cylindric, sessile. 



