6 ISOETACEAE. 



2. Isoetes Bolanderi Engelm. In ponds, Mont, to Wash., Colo, and Calif. 

 -"Western Colorado." 



Order 6. LYCOPODIALES. 



Spores uniform, minute. Family 6. LYCOPODIACEAE. 



Spores of two sorts, minute microspores and larger macrospores. 



Family 7. SELAGINELLACEAE. 



Family 6. LYCOPODIACEAE Michx. CLUBMOSS FAMILY. 

 i. LYCOPODIUM L. CLUB-MOSS, RUNNING PINE. 



i. Lycopodium annotinum L. In open places in forest, Mass, and Newf. to 

 Colo., Wash, and Alaska. Alt. 9000-10,500 ft. Beaver Creek; Estes Park; 

 Front Range, Larimer Co. ; Notch Mountain. 



Family 7. SELAGINELLACEAE Underw. SELAGINELLA FAMILY. 

 i, SELAGINELLA Beauv. LITTLE CLUB-MOSS. 



Stems rooting at base only ; spikes thick, with lax bracts ; macrospores spinulose. 



i. 5". selaginoides. 

 Stems rooting their entire length ; bracts rigid. 



Leaves without bristles at the ends ; stems slender, wiry. 2. S. mutica. 

 Leaves with distinct terminal bristles. 



Stems short, compact ; leaves light green, crowded, with long terminal bristles. 



3. 5". dens a. 



Stems long, loosely spreading ; leaves dark green, lax, with short terminal 

 bristles. 4. 5. Underwoodii. 



1. Selaginella selaginoides (L.) Link. In open places in high mountains, 

 Labr. and northern N. Y. to Alaska and Colo. Exact locality not given. 



2. Selaginella mutica D. C. Eaton. On rocks, N. M. to Colo, and Calif. 

 Alt. 6000-6500 ft. Idaho Springs ; South Cheyenne Canon ; North Chey- 

 enne Canon ; Royal Gorge. 



3. Selaginella densa Rydb. (S. Engelmanni Hieron.) On exposed rocks, 

 S. D. and western Neb. to Mont, and Colo. Alt. about 7000 ft. The Rustic, 

 Larimer Co. 



4. Selaginella Underwoodii Hieron. (S. rupestris Fendleri Underw.) On 

 exposed rocks, N. Mex. and Colo. Alt. 5000-7500 ft. North Cheyenne 

 Canon ; Minnehaha ; Pike's Peak ; South Cheyenne Canon ; Boulder ; foot- 

 hills near Ft. Collins; Manitou. 



