140 COFELAND. 
I have preferred to compromise simplicity of generic characterization 
with phylogenetic unity, and recognize the following minor groups, which 
seem to key out approximately along their lines of evolution : 
Without distinct liumus- collecting leaves. 
Fronds borne on the axis of the rhizome. 
r 
Sorl not coalescing into patches nor borne on specialized segments. 
§ Dryyiariopsis 
Sori round - ^ -P- heracleum 
Sori linear -P- coronans 
Sori composite, but not crossing the main veins, on the upper segments. 
Agldomorplia 
Sori linear, the length of the upper segments. 
Sterile segments confluent '. Merinthosorus 
Frond pinnate Photinopteris 
Fronds borne on specialized branches — « : Thayeria 
With distinct humus-collecting leaves +- Drynaria 
■ ■ r 
Thayerm as here construed contains species with very distinct fertile 
leaves. The Luzon plant which I identified specifically with Polypodium 
nedariferum Beccari of New Guinea, turns out to have fertile leaf-^ 
apices like Aglaomorplia meyenmna, making it even gcnerically distinct 
if one be disposed to carry the separation to at all a tine point. '' For 
the present, however, the fertile frond of T, Cornucopia of Mindanao is 
unknown, and it is the type of its genus. 
AGLAOMORPHA Schott emend! 
Genus Polypodiearum ex affinitate Polypodii (Drynariopsidis) hera- 
clei derivatum, frondibus rhizomate ipso ortis non vel imperfecte arti- 
culatis, sterilibus uniformibus, venatione Drynarii, soris ad partem api- 
calem frondis restrictis, compositis. 
The genus was described by Schott in 1834 to contain the single spe- 
cies A. meyeniana, and is identical with Psygmium Presl, 1836. In 
1841 Smith proposed the genus Dryostachyum for two related species, 
D. splendais and I), pilosum, which have generally been confused, but 
are very distinct. Dryostachyum and Aglaomorplia differ only in tliat 
jgments 
By 
itself I do not regard this as a* sufficient generic character unless its 
recognition will result in very great convenience. 
If one .be disposed to unite this whole group in one genus, Aglaomorplia 
is its oldest generic name, Drynaria not having been used in that sense 
until seven years later. 
Sori forming several rows § Hemistachyum 
Sori forming one row on each side of costa. 
Lamina of fertile segments continuous : § Dryostachyum 
Lamina cut away between sori § Pnygmiutn 
