274 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
The species is founded on no. 3263B of Capt. John Donnell Smith’s Guatemalan 
plants, collected at San Miguel Uspantan, Department Quiche; altitude 1,800 meters, 
April, 1892, by Messrs Heyde & Lux. The type specimen, which is the only one 
known to me, is in the private herbarium of Captain Smith. The plant was dis- 
tributed as P. subpetiolatum, but its affinities seem scarcely to lie with that group, nor 
does it appear closely allied to any middle American species. Its symmetry and 
regularity of outline have suggested the specific name here applied. 
Polypodium teresae sp. nov. Puare LNI. 
Rhizome wide-creeping, clothed with light-brown imbricate chaff; frond 80 em. 
long; stipe 8 cm. long; lamina 22 by 16 cm., broadly ovate, dark green, noticeably 
and finely pubescent over the whole lower surface, comprising about 18 pairs of 
subopposite ligulate membranaceous pinnie; the lowermost pinnee (7 em.) decidedly 
petiolate and excised below, the third, fourth, and fifth pairs nearly equal (about 8 em, 
by 12 to 18 mm.), the uppermost wholly adnate; margins throughout deeply and 
regularly biserrate; midveins not prominent, dark-colored, as are the mostly 
3-forked veins; sori about 20 pairs, equidistant from midvein and margin. 
The species is founded upon Dr. J. N. Rose’s no. 2205, collected in the Sierra 
Madre, near Santa Teresa, Territorio de Tepic, Mexico, August 12, 1897. There are 
two sheets; one, the type, no. 301119, in the U. S. National Herbarium; the other, 
smaller and less characteristic, in the Gray Herbarium. Undoubtedly the plant is 
closely related to subpetiolatum, to which species Mr. Davenport referred it; but. it 
seems sufficiently distinct in the decidedly petiolate pinne, more general distribu- 
tion of the pubescence, position of the sori, and peculiar marginal serration. 
Polypodium firmulum sp. noy. PLare LNI. 
Rhizome wide-creeping, 5 or 6 mm. thick, with yellowish brown curly chaff and 
copious rootlets thickly covered with a fine, linear, dark brown chaff; frond 22 em. 
long; stipe about 8 em. long, arcuate, greenish-stramineous; lamina 14 by-1ll em., 
broadly ovate, light green, with about 9 pairs of mostly alternate, linear-lanceolate, 
subcoriaceous, spreading pinne which are pubescent over the tissue of both sides; 
the lowermost pair (sterile) 5.2 cm. by 9 mm., at the base excised below from the 
rachis a distance of 2 mim, along the midrib to form a broad sinus, above rounded 
and slightly adnate; the second pair (fertile) 5.8 em. long, similarly excised below, 
above less rounded and similarly adnate; the third 6 em., the fourth 5.5 em. long: 
succeeding pinne: gradually shorter, considerably narrower, adnate, apices acute; the 
pinne undulate in drying, the revolute margins ineconspicuously notehed by shallow 
distant crenations which in the fertile pinne exactly correspond to the sori; sori 
averaging about 20 pairs, borne rather closer to the midyein than to the margin, one 
upon the first branch of the inconspicuous mostly 3-forked veins. 
Type in the U. 8, National Herbarium (no. 397,906), collected from ‘the shaded 
under sides of large oaks at Alvarez, San Luis Potosi, altitude 8,000 feet, by Dr. 
Edward Palmer (no. 448), September 28-October 3, 1902.’? Mixed in the number 
were plants of P. plebeyum. The type sheet comprises four separate fronds, of which 
the largest has served for the above diagnosis. 
The species is not very closely related to P. subpetiolatum, differing from that 
species in nearly all essential particulars. The coriaceous texture and the breadth 
of the frond are distinctive characters. The whitish pubescence, noticeable without 
a glass, is not confined to the venation, but occurs also on the leafy tissue; it is most 
abundant on the upper side. The sterile pinne are decidedly obtuse, and the fertile 
ones are found upon being freshened to be more or less so, though when dry they 
appear acute. The long, shallow crenations are unique, so far as I have observed, 
among the polypodies of this group. 
