Species of Lycopodium of North America 165 



1881, J. Macoun (G) ; Head of Yukon River, June, 1883, 

 Schwatka (G). 



Alaska: Lake Lindeman, 'May, 1898, R. S. Williams. Avery 

 much stunted plant 5 cm. high with strobile 1 cm. long. Speci 

 mens identical with these have been collected by Wm. Palmer in 

 Labrador, Aug., 1887 (N). 



The Mexican and Central American forms are much taller, 

 more lax, spreading, with more irregular habit. They have been 

 variously referred to Z. cornplanatum and L. thyoides H. & B. 

 (originally described from Venezuela). Without a larger array 

 of material we hesitate to separate these plants from L. corn- 

 planatum. 



17. L. alpixum L. Sp. PL 1 104. 1753 



Prostrate stems (20—50 cm. long), creeping at or near the sur- 

 face of the ground ; aerial stems numerous and branching sev- 

 eral times to form dense clumps (4-8 cm. high) of markedly 

 dorsi ventral branches with glaucous foliage ; occasional strobile- 

 bearing branches (the so-called peduncles) thicker, terete and 

 usually projecting above the general mass : leaves of the strobile- 

 bearing branches subulate, those of the purely vegetative branches 

 trimorphic, those of the upper row narrowly ovate, acute, those 

 of the lateral rows thick, with one nerve asymmetrically placed, 

 laterally truncate, acute, falcate, curved toward the under side, 

 those of the under row trowel -shaped : strobiles sessile (1-2 cm. 

 long), with ovate acute sporophylls : sporangia reniform. 



This plant varies not a little in the amount of spreading of 

 the lateral leaves, although the characters otherwise are very con- 

 stant. It is the most highly specialized plant of the whole genus. 



Specimens have been examined as follows : 



Alaska: Disenchantment Bay, Aug., 1892, F. Funston 

 (N) ; July, 1879, L. M. Turner (N) ; Bischoff (N) ; Yakutat Bay, 

 Aug., 1892, 1 175 M. F. Funston (G, C) ; Juneau, Aug., 1891, 

 3000 feet. Grace E. Cooley (C) ; Unalaska, July, 1872, M. W. 

 Harrington (N, C, G), Oct., 1871 (G), Dr. Mertens (G). 



British Columbia : Cascade Mts., Ore. Bound. Comm., Dr. 

 Lyall, 1859 (G upper specimen only), Griffin Lake, Aug., 1889, 



J. Macoun (U). 



Greenland: Sakkertappen, July, 1886 (G) ; Frederickshaad, 



Aug., 1886 ; Kolderup-Rosenvinge (G). 



