84 Rhodora [May 
A. cristatum marginale Davenp. Where swamps meet the rocky 
woods, rare. First described by Mr. Davenport from northern 
Essex County; Boxford, Merrimac, Salisbury, Medford, Byfield, 
Brockton; see Davenp. Bot. Gaz. xix. 494, 495. 
A. spinulosum (O. F. Müller) Sw. Low open woods, frequent. 
Var. intermedium (Muhl.) D. C. Eaton. Rich woods, frequent. 
Var. dilatatum (Hoffm.) Hook. Swampy woods, fairly plentiful 
at Brockton (A. A. Eaton). 
Forma anadenium B. L. Robinson. This form, characterized by 
a glandless or essentially glandless indusium, includes the great- 
er part of what has heretofore passed as var. dilatatum in Amer- 
ica. It may be distinguished from the typical A. spinulosum 
by the narrower firmer and darker brown scales of the stipes 
and from var. intermedium by its broader ovate fronds and 
glandless indusium. In our region it is relatively rare and 
never quite so characteristic as in mountain specimens. Re- 
ports indicate that it has been found in Chelsea, Dedham, 
Manchester, and Woburn. i 
Var. concordianum (Davenp.) Eastman. Rich swampy woodland, 
Concord (Purdie & Brewster, Davenport & Purdie). See 
RnHopona, vi. 31-33. 
CYSTOPTERIS. 
C. fragilis (L.) Bernh. Moist or wet rocks and ledges in shade; 
not common, especially southward. 
1 Concerning this form Dr. Robinson makes the following statement: “ Aspidium 
spinulosum, var, dilatatum (Hoffm.) Hook., as it occurs in Europe, regularly exhibits a 
glandular indusium, a fact substantiated by specimens and by the statements of 
several critical and reliable authors, such as Moore, Milde, Christ, and others. This 
European form must be regarded as the typical state of the variety. Until recently 
it has been almost unknown in America. To it seems to belong, however, the plant 
not long since described as Nephrodium spinulosum, var. fructuo sum Gilbert, and study 
of a considerable suite of American specimens referred to Var. dilatatum shows that the 
indusium is occasionally glanduliferous as in the European plant. Nevertheless, as 
Prof. D. C. Eaton long ago remarked the indusium in the American Var. dilatatum is 
habitually glandless, This glandless form, which is readily recognizable with a good 
lens, seems never to have had a distinctive name and may therefore be called A. sPINU- 
LOSUM, var, DILATATUM, forma anadenium, n. f. indusio glandulis fere vel omnino des- 
tituto.— As an appropriate type-specimen for this new form I would mention a plant 
collected in deciduous woods, alt. 760 m., 14 August, 1895, on Barren Mt., Elliottsville 
Piscataquis County, Maine, by M. L. Fernald, no, 426 (type in hb, Gray; cotypes in 
several public and private herbaria). Forma anadenium is widely distributed in Atlantic 
North America, chiefly in mountainous regions." 
