198 Rhodora [SzPreaeeiil 






















that the former species has “serraturis subbidentibus, infima superiore 
elongata.” 
A comparison of the specimens in the Gray Herbarium of Athyrium — 
Filix-femina from western North America, with those from Europe 
shows that in all important respects there is complete agreement. — 
Rhizome, scales, general form of frond, sori, indusia, sporangia and 
spores all agree. The indusia of the larger sori, measured in over 
twenty-five specimens give an average height of 0.55 mm., and an— 
average length of 0.8 mm., precisely the dimensions obtained from 
European material. 
The stalks of the sporangia proliferate as they commonly do in 
European material of A. Filix-femina. No case has been seen in west 
American material in which a branch of the sporangial stalk bears a _ 
glandular structure such as is common in the east American species, | ; 
and is occasionally found in European material of A. F ilix-femina. 
The spores are yellowish, and average 38.9 < 24 y in size. 
Like the European A. Filix-femina, the northwestern plant is very 
variable. Some forms are common to both continents, while others 
appear to be peculiar to one or the other. The coarser European 
forms may be matched exactly with American material, while some 
of the finer cut forms, particularly var. multidentatum (Déll) Milde, 4 
and the form commonly known in Europe as var. rhaeticum,' appear 
to be wanting in this continent. » A characteristically American variety 
is A. Filix-femina var. sitchense Ruprecht ex Moore,? a large and coarse 
PR Sacagawea ona oe Scoletent below 28. eee 



d sh bao he saommaepaegnpg hn sehen 
ose pl t tob Athyri m Fili. -femina N. ist. of Brit. Ferns, 
ed. 2, 245 (1844) 
2 » Thomas, Index Fil. 183 (1860), where this combi combination appears le the aaa 
preg seclenmiaie = yertony Ruprecht’s sitesinde a: tala. Coeene. Crypt. Vase. Imp. Ross.» 
; i Filix 
658. Mamie a Seadies tripinnatum * * # 
65y. brevius sori plerumque rotu 
pawlowsk! (etiam pinnulis angustis) et Unalaschka!; Kadiak (Blaschcke!). sr aaa 
etiam pr. Kola in Lappon. ross ross. crescit. (Hb. Baer!), 
655. Athyrium sitchense * Frone interdum 4 pedalis; indusia brevissima fere cystop- 
primariae 

pn pinnae secundariae pl. min. spatio pollicis dimidii disjunctae, Sitcha 
(Mertens!). é 
ok eo and *'3 Athyrium silchense”’, has been cited by a 
various authors, sometimes as the publication of species, and and sometimes as that of varieties. 
Ruprecht, himself, in the preface to his paper (x. et P. 6) speaks of them as “species secundi 
ordinis 5. d tanter servantes,”” 
Ruprecht’s other subspecies, + Athy vel has been identified with th silchense 


