428 IOWA ACADEiMY OF SCIENCE Vol. XXV, 1918 



No mention is made of the occurrence of species at the smaller 

 places except as they may differ from Juneau or Sitka. Be- 

 tween the two latter places there is considerable difference as 

 wall be noted from the list which follows. 



The whole re.^ion is comparable to a series of submerged moun- 

 tain ranges with the sea filling the valley's. It is heavily for- 

 ested except the mountain tops and small areas of bog or of 

 flats at the mouth of streams. Timber line is about 2,500 feet at 

 Sitka and somewhat less at Juneau. Rainfall is abundant wdth 

 much cloudy weather. Typical peat bogs or Muskeg occur while 

 wet and springy places are found everjnvhere. 



Synonyms are given only in cases where they have been in 

 common use or were used by one or the other of those who made 

 determinations. Common names are given only when well estab- 

 lished 'by general or local use. 



POLYPODIACE^. 



Palypodkim vidgare occidentale Hook. Common in moss on 

 rocks, logs, and trees. Considered by some to be P. glycyrrhiza 

 D. C. Eaton. 



Thelypteris phegapter*is (L.) Slosson. (Phegopteris phegop- 

 teris (L.) Keyserling.) {Dr\yopteris phegopteris (L.) C. Chr. 

 A fairly comm^on woodland species. 



T}iel,ypteris dryopteris (L.) Slosson. (P. dry&pteris (L.) 

 Fee.) (D. dryopteris (L.) Christ.) Common in woods. 



Pteridium acquilioium pubescens Underw. Brake or Bracken. 

 Moderately frequent at Sitka but not collected at Juneau. 



Cryptogamma acrostichoides R. Br. Found in the crevices 

 of rocks on the mountain sides. 



Adiantuni pedatum aleuticum Rupr. Maiden Hair Fern. 

 Quite common on wooded mountain sides. Rare near sea level. 



Struthiopteris spicant (L.) Weiss. {Lomaria- spicant (L.) 

 Desv.) Common in woods around Sitka and collected at Jualin 

 but not observed around Juneau. Deer are said to be very fond 

 of it, hence it is called Deer Fern. 



Asplenmm viride Huds. A small fern f recpient in the crevices 

 of rocks. 



Athyrinm cyclasorum Rupr. Our largest fern. It often fills 

 low, wet places with a rank growth three to five feet high. 



Athyrinm alpestre (Noppe) Rylands. Collected in an alder 

 thicket at about 2200 feet elevation near Juneau. 



