MEXICAN AND GUATEMALAN POLYPODIUMS. 275 
MAXON 
I would refer here also specimens in the D. C. Eaton herbarium, collected by 
Parry & Palmer on ‘‘ Lerios Mountain, 15 leagues east of Saltillo,’? Coahuila, Mexico, 
in 1880. The plants were determined by Professor Eaton as ‘near P. subpetiolatun ” 
and are so labeled. In the published report @ they are listed under this name with 
the remark ‘small specimens which agree best with this species.” The error was 
perpetuated in the Biologia Centrali-Americana. b The specimens are too immature 
to have served for description, but with the material now at hand they may be 
definitely placed under P. firmulum. 
Polypodium legionarium Baker in Hook, «& Baker, Syn. Fil. 337. 1868. 
Polypodium macrodon Hook. Sp. Fil, 4: 218. 1862, not Reinw. (sec. Baker). 
Specimens examined: 
Mexico: Chiapas, Dr. Ghiesbreght, 1864-1870, no. 393 (G, E); no. 294 (KE). 
Guatemala: Coban, Vera Paz, altitude 1,500 meters, O. Salvin (G); without 
station, O. Salvin (G); Calderos, O. Salvin (G). 
Of these sheets I suppose nos. 393 and 294 to be most typical of the species in 
its mature development. They are magnificent specimens, agreeing in every par- 
ticular with Hooker’s very complete and careful description so inaccurately and inade- 
quately paraphrased by Mr. Baker. Salvin’s Calderos specimen, aberrant and worn, 
is referred here with some doubt. 
Polypodium fissidens sp. nov. Piatt LNI. 
Rhizome creeping, very firm, whitish, clothed with bright brown chaff; frond 40 
to 56 cm. long; stipe 10 to 18 em. long, stramineous, distinctly articulate, pubescent 
above; lamina 30 to 38 cm. by 13 to 18 cm., membranaceous, ovate to obcuneiform, 
broadest near the base, pubescent on both surfaces; pinne: about 30 pairs, exactly 
opposite, wholly adnate (excepting the lowermost two or three pairs, which may be 
somewhat rounded either above or below), obtusish at extremity, varying greatly 
in dimensions according to degree of fertility and bearing (maximum) 25 to 28 pairs 
of large sori near the sharply biserrate fimbriate margins on the prolonged first 
branches of the mainly trichotomous entirely free veins, which are rather noticeably 
enlarged at their extremities. 
The species is founded upon no. 244 of Dr. Ghiesbreght’s ‘ Filices Austro-Mexi- 
canae,’’ collected in Chiapas, 1864-1870. Three sheets of this number have been 
examined; two in the D. C. Eaton herbarium (the larger of which is designated as 
the type); the third in the Gray herbarium. This number was determined by Hall ¢ 
as P. biserratum, a disposition which, in view of the copious pubescence, peculiar 
position of the sori, fimbriate margins, and generally distinct facies of the plants, seems 
quite remarkable. 
Polypodium adelphum sp. noy. Piate LXII. 
Rootstock creeping, about 8 mm. thick, clothed with long-attenuate chaff of a dull 
burnt umber, becoming lighter at the bases of the stipes; fronds 3.5 to 7 dm. long; 
stipe 10 to 20 em, long, rigid and glossy; lamina 25 to 60 cm. long by 15 to 25 cm. 
broad, ovate, comprising from 10 to 18 pairs of membranaceous, subopposite, linear 
pinnze becoming more or less alternate above; the lowermost pinne slightly shorter 
than the succeeding three or four pairs, which in the largest fronds measure about 
12 to 15 cm. by 15 mm. (at the broadest point) ; pinne mostly subpetiolate, the base 
subacutely cuneate, and very slightly winged above, only the pinnee of the upper 
«Proc. Am. Acad. 18: 183. 1883. 
b Biolog. Central. Am. Bot. 3: 662, 1885, 
¢Franklin W. Hall, Catalogue of a Collection of Ferns made in Southern Mexico, 
mainly at Chiapas, by A. Ghiesbreght, in the years 1864-1870, 2. 1873. (Pp.10. New 
Haven. ) 
