MAXON—STUDIES OF TROPICAL AMERICAN FERNS. 61 
below the midvein and fully adnate above, the adnate upper portion of the first pair 
overlapping the clasping base of the second, there being only a very slight connecting 
foliar wing along the rachis, In one of these (no. 460766), moreover, this condition 
occurs in the case of the third pair of pinne also, and the foliar wing becomes well 
developed only between the third and fourth pairs of pinne and between succeeding 
pinne. In all four sheets examined the superabundance of leafy tissue, which must 
have given a remarkable fluted appearance to the living fronds, is very noticeable.” 
One of the Ghiesbreght plants shows this peculiar condition so admirably that a 
\botographic illustration is given herewith (pl. 33). 
The species has been reported! by Doctor Christ also from Chiapas, the specimen 
collected by G. Munch. 
Goniophlebium rhachipterygium (Liebm.) Moore, Index Fil. 396, 1862. Pare 34. 
Polypodium rhachipterygium Liebm. Vid. Selsk. Skr. V. 1: 191. 1849. 
Polypodium stenoloma D. ©. Eaton, Proc. Amer. Acad. 8: 618. 1873. 
Polypodium donnell-smithii Christ, Bull. Herb. Boiss, IT. 6: 291. 1906. 
Doctor Christ has recently ? pointed out the identity of P. donnell-smithii, described 
from Guatemalan specimens collected by von Tiirckheim (Donnell Smith 8823), with 
the earlier P. stenoloma D. C. Eaton, founded upon Ghiesbreght 386, from Chiapas, 
Mexico. A still earlier publication of the species is that by Liebmann, mentioned 
above, whose specimens came from Teotalcingo, Chinantla, Oaxaca, Mexico, June, 
1842. A very complete sketch of these, together with a fragment, both sent by Mr. 
Christensen at the writer’s request, leaves no doubt as to their identity with the plants 
described subsequently by Professor Eaton and by Doctor Christ. 
The illustration presented herewith (pl. 34) is of the type specimens of P. stenoloma 
(herb. D. C. Eaton), showing the plants at about one-half natural size. 
Lycopodium dichaeoides Maxon, Proc. Biol. Soc. Washington 18: 231. 1905. 
Besides the two collections from Alta Verapaz originally mentioned, this species 
is known to the writer only upon Captain Smith’s no. 958, collected at Pansamala, 
Alta Verapaz, Guatemala, at about 1,200 meters elevation, by von Tiirckheim, in 
July, 1886. The species, though obviously related to L. aqualoupianum, is well 
marked by its short strobiles and its short, rigid, achene-like sporophyls. 
Notholaena rigida Davenp. 
The original specimens are from limestone ledges, Sierra de la Silla, Nuevo Leon, 
Mexico, May 31, 1889, Pringle 2599. The only other plants of this species seen by 
the writer are those collected near Victoria, Tamaulipas, Mexico, altitude 320 meters, 
February to April, 1907, by Dr. Edw. Palmer (no. 142). The species is strongly char- 
acterized by its lustrous, dark castaneous stipes and rachis and by its branched, lig- 
neous rhizome, the latter closely invested with very rigid, opaque, blackish scales. 
Pellaea notabilis Maxon, Contr. Nat. Herb. 10: 500. 1908. 
A second record for this species rests upon two dwarfed fronds in the herbarium of 
the New York Botanical Garden: These were collected near San José, Tamaulipas, 
Mexico, altitude 600 to 1,100 meters, by Prof. James F. Kemp, of Columbia University, 
in 1902. They measure only 8 and 12 cm. high, respectively, and are thus much 
smaller than the original specimens, which are also from Tamaulipas. 
Polypodium duale Maxon, nom. nov. 
Acrostichum serrulatum Swartz, Prodr. Veg. Ind. Occ. 128. 1788. 
Polypodium serrulatum Mett. Fil. Hort. Bot. Lips. 30. 1856, not Swartz, 1801. 
The above change of name for the diminutive tropical fern described from Jamaica 
by Swartz in 1788 as Acrostichum serrulatum is made necessary by the use of the same 
1 Bull. Herb. Boiss. I]. '7: 413. 1907. 2 Bull. Soc. Bot. Genéve 1: 220. 1909. 
