DISTRIBUTION IN TIME AND SPACE. 



Lycopodiuni ubscurum. 

 clavatum. 

 complanatum. 

 Selaginella apus. 

 Isoetes lacustris. 



Tuckermani. Local, 

 echinospora, var. Braunii. 

 var. robusta. 

 var. Boottii. 



Local. 



Isoetes echinospora, var. muricata. 

 Local, 

 saccharata. Local, 

 riparia. 

 Engelmanni. 

 var. gracilis, 

 var. valida. 

 melanopoda. 

 Butleri. Rare. 



OCCIDENTAL. 



(Species marked * are confined to California ; those marked t are found only in 



Oregon.) 



Polypodium falcatum. 



Californicum.* 



Scouleri. 

 Gymnogranime triangularis. 

 Notholasna Newberryi. 



cretacea.* 



tenera. 

 Adiantum emarginatum. 

 Pteris aquilina, var. lanuginosa. 

 Cheilanthes Californica.* 



viscida.* 



Coopers.* 



gracillima. 



Parishii.* 



fibrillosa.* 



Clevelandii.* 

 Pellaea Breweri. 



andromedaefolia.* 



brachyptera. 



ornithopus.* 



densa. 



Bridgesii.* 

 Lomaria spicant. 

 Woodwardia radicans. 



Phegopteris alpestris. 

 Dryopteris munita. 



mohrioides.* 



aculeata.* 



var. Californica'.* 

 var. angularis.* 



Nevadensis.* 



rigida, var. arguta. 

 Woodsia scopulina. 



Oregana. 

 Azolla filiculoides. 

 Marsilea vestita. 

 Pilularia Americana. 

 Equisetum telmateia. 



robust urn. 

 Selaginella Oregana. 



Douglasii. 

 Isoetes pygmsa.* 



Bolanderi. 



Howellii.t 



nuda.t 



Nuttallii. 



Suksdorfii. 



maritima. 



SONORAN. 



(Species marked * are found in our region only in Arizona; those marked t are 



Texan.) 



Polypodium thysanolepis.* 

 Gymnogramme Ehrenbergiana. 

 Notholjena sinuata. 



ferruginea. 



Parryi. 



Nothola?na Aschenborniana.* 

 Candida. 

 Hookeri. 

 SchaiTneri.t 



