MICHIGAN ACADEMY OF SCIENCE. 91 



which the leaves are grouped. Most authors attribute six 

 ranked leaves to Michaux's species but they evidently have had 

 another varietj' in hand, one that is exactly intermediate between 

 this plant and L. obscuruni, Lin. The bianchlets are erect with 

 only the tips slightly curving outward, and are senii-dorsiveutral ; 

 the leaves are unequal in six ranks, ('<)rres])onding to three upper 

 and three lower, the latteral row on each side being obsolete; the 

 lower leaves are from 2 to 3i/^ mm. in length and the upper from 

 31/^ to 4 mm. ; the middle upper row bearing the longest leaves, 

 the middle lower row, the shortest, while the others are success- 

 ively intermediate. The stems are from 4-0 inches below the sur- 

 face. Spikes 2-6 cm. It may be a cross between the other two 

 forms but it has longer spikes and the stems are deeper in the 

 ground than in either. It may be known as lAcoroDiuM obscurum, 

 Lin. variety hybridum_, N. Var. The species and its synonymy is 

 as follows : 



Lycopodium obscurum Lin., Sp. PL, 1002, 1753. 



Lycopodioidcs radiatuin dichotomum. Dill., Muse, 274, t. 67, 1741. 



Lyco^iodium dcndroideum var. ohscurum (Lin.) Torr. ex. Beck., 

 Botany, 460, 1833. 



Keweenaw Peninsula, No. 682, September 6, 1888. In rich Avoods 

 under evergreens. Frequent. 



Lycopodium obscurum var. hybridum, Farwell. 



Lycopodium Dcndroideum Willd., Sp. PI., 5, 21, 1910, and many 

 American authors, not of Michaux. 



Lycopodiumohscurum Eaton & Wright, N. Amer. Bot., 309, 1840, 

 and many American authors not of Linnaeus. 



Keweenaw Peninsula, No. 3908, September 1914. Along the 

 edge of Avoods and thickets. The common form. 



Lycopodium obscurum var. dcndroideum (Mx.) D. C. Eaton in 

 Gray's Manual, 696, 1890. 



Lycopodium dendroideum Mx., Fl. Bor. Amer., 2, 282, 1803. 



Keweenaw Peninsula, No. 681, September 6, 1881. On knolls in 

 the open. The rarest form. 



Lycopodium complanatum, Linne. 



This is a very variable species and its forms have been consider- 

 ed as species by those botanists who think that all variations of 

 plants should be considered as distinct species, discarding all minor 

 categories. This species, like L. obscurum, Linne, shows two well 

 marked series ; one with the leaves of equal length and in 6-8 ranks 

 (stems not dorsiventral) and one with the leaves of unequal length 

 and in 4 ranks (stems dorsiventral). The distinctions between 



