140 
COPELAND. 
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 humus-collecting leaves. 
Fronds borne on the axis of the rhizome. . 
Sori not coalescing into patches nor borne on specialized segments. 
§ Drynariopsis 
Sori round . ,...x.~ P. heracleum 
Sori linear P. coronans 
Sori composite, but not crossing the main veins, on the upper segments. 
Aglaomorpha 
Sori linear, the length of the upper segments. 
Sterile segments confluent Merinthosorus 
Frond pinnate i...:...,......',C#.i-h:x.. ; ..^m..,.-.4sP7iotfriopteris 
Fronds borne on specialized branches : .'. Thayeria 
With distinct humus-collecting leaves .......j....,„h^ Drynaria 
Thayeria as here construed contains species with very distinct fertile 
leaves. The Luzon plant which I identified specifically with Polypodium 
nectariferum Beccari of New Guinea, turns out to have fertile leaf- 
apices like Aglaomorpha meyeniana, making it even generically distinct 
if one be disposed to carry the separation to at all a fine 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 Polypod-ii (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. splendens and l). pilosum, which have generally been confused, but 
are very distinct. Dryostachyum and Aglaomorpha differ only in that 
the lamina of the fertile segments of the latter is more reduced. 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, Aglaomorpha 
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— BM:.- § Psygmium 
