116 AMERICAN FERN JOURNAL 
marginalis Kaulf. The last-mentioned plant is the type 
and sole species of Mildella, a genus proposed by Trevi- 
san,’ reduced to Pellaea by Christensen. If Mildella 
were to be recognized as distinct it should probably 
include (besides those mentioned above) a few tropical 
species, for example, the group of C. marginata. Pend- 
ing a critical review of the whole group it seems prefer- 
able, however, to regard Mildella as a subgenus of 
ehalcdae This requires the transfer of Pellaea densa 
to Cheilanthes and, unfortunately, the assignment of 
a new species name, because of the earlier Cheilanthes 
densa Fée, 1852. The plant may be known, therefore, 
as Cheilanthes siliquosa, in allusion to the silique- 
like form of the narrowly elongate segments. The 
synonymy is given below.' 
Cheilanthes pyramidalis arizonica Maxon, subsp. 
nov.—Rhizome oblique or short-decumbent, coarsely 
radicose, freely paleaceous upon and among the bases 
of the crowded stipes; scales ascending, linear-attenuate, 
4-5 mm. long, about 0.5 mm. broad at the base, dark 
castaneous, opaque, nearly concolorous, rigid, the acicu- 
lar apices fragile, subentire. Fronds several, fasciculate, 
15-28 cm. long; stipes 8-17 em. long, fragile, lightly 
flexuous, castaneous, naked above the base; lamina 
deltoid-ovate, subpentagonal, 7-13 cm. long, 4-10 cm. 
broad, subquadripinnate, all the rachises but the glossy 
castaneous basal parts of the primary and larger sec- 
ondary ones very narrowly greenish-marginate; pinnae 
laxly ascending or the basal ones projected forward, 
’ Rend. Ist. Lombardo II. 9: 810. 1876. 
4 Cheilanthes siliquosa Maxon, nom. 
Onych*um syeooy Brack. in Wilkes, vu. ye a Exped. 16: 120. 
Patiosa tease Hook. 4 . Fil. 2: 150. pl. 125.B. 18 
Allosorus densus Kuntze, Rev. Gen. PI. 2: 806. ps 1. 
sg gh tp densa Diels in Engl. & Prantl, Nat. Pflanzenfam. 14: 
