414 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
between ‘‘Camp I’’ and the Divide, Holcomb’s trail, above El Boquete, Chiriqui, 
Panama, altitude about 1,750 meters, March 23, 1911, by William R. Maxon (no. 
5682). Additional data are derived from other mounted specimens of the same 
number. 
In the venation of its largest pinnze Hemitelia rudis shows some approach to H. 
grandis, though it differs from that species conspicuously in eaf shape, in its much 
lesser size and degree of subdivision, and in its crenate-serrate (not crenately lobed) 
segments. It is more nearly related to H. subglabra of Costa Rica, but differs in 
venation and in its coarsely crenate-serrate (instead of subentire to lightly undulate- 
serrate) margins. The deeply lobed proximal basal segments, overlying the rachis, 
recall the West Indian H. grandiflora,! a species with which is has no close connection, 
EXPLANATION OF PLATE 16.—Basal portion of a pinna of the type collection. Natural size. 
THE NORTH AMERICAN SPECIES OF HEMITELIA, SECTION 
EUHEMITELIA. 
In a previous paper? of this series the writer, in the course of a 
brief review of the taxonomic history of Hemitelia, expressed the 
view that two fairly distinct sections of the genus might properly be 
recognized: “(1) Euhemitelia and (2) Cnemidaria; the first, embrac- 
ing large species of truly arboreous growth, with mainly tripinnatifid 
fronds and narrow, often rather minute segments; the latter, plants 
which are scarcely arborescent, with ample, pinnate to bipinnatifid 
(or rarely tripinnatifid) fronds, the leafy parts broad and little 
dissected.”’ 
The North American species of the section Cnemidaria were treated 
in that paper, eight out of the eighteen there recognized being 
described as new. There were included also notes upon three species 
known only from South America and comments upon five doubtful 
species described long ago from various parts of tropical America. 
In the present paper the North American representatives of the 
typical section of the genus, Euhemitelia, will be similarly treated. 
The type species is H. multiflora (J. E. Smith) R. Br. 
It must be admitted that Euhemitelia is not an especially homo- 
geneous group and that, leaving the indusia out of consideration, its 
species might be placed in either Cyathea or Alsophila without great 
violence. Having regard to the indusia, moreover, a close interre- 
lationship of its species is even less evident, since this structure has 
assumed several very diverse forms. Thus, although Hemitelia. 
multiflora shows indusia very like those of the species of section 
Cnemidaria, other species (for example, H. sessilifolia, H. sherringii, 
and H. muricata) have the indusia deeply cleft and more or less 
perfectly deciduous, and in H. costaricensis the subdivision is carried 
even further. On the other hand, Hemitelia wilsoni has more than a 
few of its indusia of a subcyathiform type; that is, extending more 
'See Contr. U. 8. Nat. Herb. 16: 41. 1912. 
*Contr. U. S. Nat. Herb. 16: 26. 1912. 
