decumbens Meyer 
irriguum Milde 
nemorosum <A. Br. 
polystachyon A. A. Eaton 
pseudo-sylvaticum Milde 
fiuviatile LL. 
(E. limosum 1,.) 
hyemale L,. 
laevigatum A. Br. 
littorale Kuehl. 
Mexicanum Milde 
palustre L,. 
pratense Ehrh. 
ramosissimum Desf. 
robustum A. Br. 
seirpoides Michx. 
sylvaticum L,. 
Telmateia Ehrh. 
variegatum Schleich. 
220 
221 
222 
223 
224 
225 
226 
g27 
228 
229 
230 
23 
232 
233 
234 
235 
236 
237 
LYCOPODIACEAE 
Lycopodium 
238 adpressum (Chapm.) Lloyd & 
Underw. 
alopecuroides IL. 
alpinum I,, 
annotinum I[,. 
pungens Spring. 
Carolinianum I,. 
eermium Ty. 
chamaecyparissus A. Br. 
clavatum L,. 
complanatum I. 
inundatum TL, 
Bigelovii Tuckerman 
luciduluin Michx. 
obscurum LI, 
(L. dendroideum Michx.) . 
pinnatum (Chapm.) Lloyd & 
tops) 
240 
241 
242 
243 
244 
245 
246 
247 
248 
249 
250 
251 
252 
Underw. 
porophilum Lloyd & Underw. 
253 
254 
255 
256 
sabinaefolium Willd. 
selago L, 
Sitchense Rupr. 
Psilotum 
257 nudum (I,.) Griseb. 
3) 
SELAGINELLACEAE 
_ Selaginella 
258 apus (L.) Spring. 
259 arenicola Underw. ,. 
260 Bigelovii Underw. 
261 bryoides (Nutt.) Underw. 
(S. cenerascens A. A. Eaton) 
Douglasit (T. & G.) Spring. 
lepidophylla Spring. 
Ludoviciana A. Br. 
mutica D. C. Eaton 
Pringlei Baker 
rupestris (L,.) Spring. 
Fendleri Underw. 
rupincola Underw. 
selaginoides (L.) Link 
struthioloides (Presl) Underw. 
fortipila A. Br 
Watsoni Underw. 
ISOETACEAE 
Isoetes 
Bolanderi Engel. 
Butleri Engelm. 
276 Dodgei A. A. Eaton 
277 Eatoni Dodge 
278 echinospora Boottii Engelm. 
279 Braunu (Durieu) Engelin. 
280 muricata (Durieu) Engelin. 
281 robusta Engel. 
282 Engelmanni A. Br. 
283 gracilis Engelm. 
284 valida Engel. 
flaccida Shuttlew. 
Chapmani Engelm. 
foveolata A. A. Eaton 
Howellit Engelm. 
(7. nuda, also 7. Underwood ) 
) lacustris L. 
Macouni A. A. Haton 
maritima Underw. 
melanopoda J. Gay 
melanospora Engelm. 
minima A. A. Eaton 
Nuttallii A. Br. 
Orcutti .A. A. Eaton 
pygmaea Engelm. 
