structed the generic character as to admit Pteris crispa of
Europe, which agrees well enough with the former species in
habit, although the sori are roundish rather than linear, and
terminal on the veinlets. The two plants are in fact so
nearly allied that Hooker and Milde have considered the
American only a variety of the European, and Hooker said
that some of the Scottish specimens in his collection were
almost identical with those from North America, and that he
had some from the United States and from British Columbia
quite agreeing with the common European form. While it
is indisputable that there may be specimens from one continent
much resembling the type usually seen in the other,
yet the normal type of C. acrostichoides is so different from
that of C. crispa, that, for the present purpose certainly, it
is better to keep them apart. Allosorus foveolatus is certainly
a stunted form of our plant from Alaska, with the ends of
the veinlets in the sterile plant enlarged and marked by a
semi-translucent oval depression, which may be seen also in
specimens from Colorado, Lake Superior and California. A .
Sitchense I have not seen, but it may be safely assumed to
be but little different from small specimens of our common
plant.
Plate LIX., Fig. 1 - 5 .— Cryptogramme acrostichoides from California.
Fig. 2 is an enlarged view of a fertile pinnule. Fig. 3, the same
after it has been opened and the sporangia partly removed. Fig. 4 is
a pinnule of a sterile leaf, enlarged, and Fig. 5 is a spore.
V,: li
P l a t e LIX. — F ig . 6 - 1 0 .
AD IAN TUM T R IC H O L E P IS , F é e .
Soft Maidenhair.
A d i a n t u m t r i c h o l e p i s : — Root-stock short, creeping,
chaffy; stalks clustered, slender, about a'span long, reddish-
black and polished, like the rachis and its branches; fronds
six to twelve inches long, deltoid-ovate or broadly pyramidal,
three or four times pinnate at the base, simply pinnate at
the apex; primary pinnæ triangular-lanceolate, rather long-
stalked; ultimate pinnules petiolulate, three to six lines broad,
roundish with a truncate or subcordate base, rarely lobed,
hairy on both surfaces; margins obscurely denticulate, the
veinlets extending to the points of the teeth; involucres finely
pubescent, roundish-oblong and transversely elongated on the
same pinnules.
Adianhim tricholepis. F e e , 8me Mém., p. 7 2 . — K e y s e r l in g , Adiantum,
pp. 1 5 , 3 7 . — E aton, Ferns of the South-West, p. 3 2 6 .
Adiantum dilatatum, N u t t a l l , MS., and as quoted in Hooker, Sp. Fil.,
ii., p. 4 3 .
Adiantum fra g ile , var. pubescens. M a r t en s & G a l eo t t i, Syn. Fil. Mex.,
p. 7 2 , according to Fée.
Adiantum Chilense, var. pilosulum, L ie bm a n n , Mex. Bregn., p. 1x 5 ,
according to Keyserling.
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J