Lycopodium 



Lycopodiaceae 



63 



50 



Map 53 



Lycopodium inundatum L. 



55 



Map 54 



Lycopodium obscurum L. 



6. LYCOPODIACEAE Michx. Clubmoss Family 

 1. LYCOPODIUM L. Clubmoss 



[Wilson. The identity of Lycopodium porophilum. Rhodora 34 : 169-172. 

 1932. The spores of the genus Lycopodium in the United States and 

 Canada. Rhodora 36 : 13-19. 1934.] 



Sporangia in the axils of normal leaves, not forming a well marked terminal spike. 

 Leaves linear-attenuate to lanceolate, entire (sometimes with a few minute serra- 

 tions toward the apex), usually widest below the middle; plants yellowish 

 green, tufted, erect or slightly decumbent at the base. . . 1. L. Selago var. patens. 

 Leaves oblanceolate, widest near or above the middle, serrate or entire, arranged in 

 alternate zones of shorter and longer leaves, the shorter ones more frequently 

 bearing sporangia in their axils; stems bright or dark green, in loose clusters, 

 decumbent. 



Blades of leaves serrate 2. L. liicidulum. 



Blades of leaves entire or slightly serrate, often some of them of a linear type. 



(See excluded species no. 17, p. 1022.) L. lucidulum var. occidentale. 



Sporangia borne only in the axils of the upper (bracteal) leaves, forming a spike. 



Bracteal leaves linear-attenuate from a distinctly broadened ovate base 



3. L. inundatum. 



Bracteal leaves scalelike, yellowish, very different from those of sterile part of the 



stem. 



Ultimate sterile branches with their leaves mostly 5-10 mm wide, free portion of 



leaves more than 3 mm long. 



Stems creeping on the surface of the ground with short, leafy branches, the 



leaves linear, bristle-tipped at apex; fertile branches terminating in a 



slender peduncle (1-1.5 dm long), bearing 2-4 slender cylindrical spikes. 



(See excluded species no. 15, p. 1021.) L. clavatum. 



Stems subterranean, bearing scattered upright branches resembling miniature 

 coniferous seedlings; leaves merely acute at the apex; spikes 1-3, essentially 



sessile 4. L. obscurum. 



Ultimate sterile branches with their leaves less than 5 mm wide; free portion of 



leaves less than 3 mm long. 



Horizontal stems rather deeply buried in the ground; branchlets bluish green, 



1-1.75 (2) mm wide; leaves on ventral and dorsal sides of the branchlets 



about equal. (See excluded species no. 18, p. 1022.) L. tristachyum. 



