72 University of California Publications in Botany [VOL. 9 



ANNOTATED LIST OF THE SPECIES OF VASCULAR 



PLANTS GROWING WITHIN THE BOREAL 



REGION OF THE SIERRA NEVADA 



1. POLYPODIACEAE (FERN FAMILY) 



Indusia present, covering the sori at least when young. 



Sori marginal, Avith a false indusium formed by the reflexed and altered margin 



of the frond. 

 Stalks of the fronds light colored; fronds evidently of two sorts, sterile 



and fertile 1. Cryptogramma 



Stalks of the fronds dark; fronds not evidently of two sorts. 

 False indusium continuous at edge of segment; fronds small. 



Stalks of the fronds chaffy or hirsute 2. Cheilanthes 



Stalks of the fronds naked 3. Pellaea 



False indusium not continuous; fronds large 4. Adiantum 



Sori not marginal; each sorus with its own true indusium. 



Indusium peltate or laterally attached, superior and entire. 



Sori oblong, parallel to the oblique lateral veins 5. Asplenium 



Sori orbicular or reniform. 

 Indusium centrally attached. 



Indusium round, without a sinus 6. Polystichum 



Indusium reniform 7. Dryopteris 



Indusium laterally attached 8. Cystopteris 



Indusium inferior and fimbriate 9. Woodsia 



Indusia never present 10. Athyrium 



1. CKYPTOGRAMMA 



1. Cryptogramma acrostichoides, R. Br. App. Frankl. Jour., p. 

 767. 1823. 



Type locality. "In shady rocky woods, between lat. 56 and 60 

 north." 



Range. Alaska to Quebec, south to California, Colorado, and the 

 Great Lakes. 



Zone. Hudsonian and Arctic-alpine. 



Specimens examined. Plumas County, Mrs. Austin in 1877 ; cliffs 

 of granite ledges above Donner Lake, Sonne 323 ; high mountain near 

 Donner Pass, Torrey 597; Long Lake, Plumas County, 6,700 feet, 

 Hall 9,342 ; near Summit, Heller 7,027 ; Pyramid Peak, W. S. Atkin- 

 son in 1900 ; Lake Lucile Ridge, Tahoe, Dudley, June 26, 1900 ; Suzy 

 Lake, McGregor 108; Heather Lake, 8,100 feet, Smiley 161; Tahoe 

 region, 6-8,000 feet, G. B. Grant in 1906; Angora Lake, 7,600 feet, 

 Smiley 12; Mt. Tallac trail, 8,000 feet, Abrams 4825; Mono Pass, 

 9-10,000 feet, Bolander 6241; Old Tioga Road, dry ledges, R. A. 

 Ware 560 ; near Lake Tenaya, Yosemite, 8,300 feet, Smiley 699 ; Tioga 



