FIELD COLUMBIAN MUSEUM BOTANY, VOL. i. 



PTERIDOPHYTA.* 



POLYDPODIUM, Linn. 



P. Phyllitidis, Linn. 



On fallen trunk of dead tree, Cedral, Island of Cozumel, Jan. 

 5, 1895 (38). 



Specimens very large and fine. 



P. lycopodioides, Linn. 



Climbing living trees in dry open woods, Chichen Itza, Jan. 18, 

 1895 (134). 



The same fine large form collected by Mr. Pringle in upper 

 Mexico. 



ADIANTUM, Linn. 



A. tricholepis, Fee. 



Mouth of small cave, north aspect of the Cerro Grande, Izamal, 

 Jan. 13, 1895 (54). Crevices of north aspect ruin of the Monjas, 

 Chichen Itza, Jan. 17, 1895 (112). 



Both are excellent specimens of this once rare, beautiful fern. 



PTERIS, Linn. 



P. acquilina caudata (Linn.), Hook. 



Pteris caudata, Linn. Collected by Dr. Gaumer on the Island of 

 Cozumel, 1885. 



HEMITELIA, R. Brown. 



H. Hartii, Baker. 



Collected by Dr. Gaumer on the Island of Cozumel, 1885. 



CHEILANTHES, Swartz. 



C. leucopoda, Link. 



Collected by Dr. Gaumer on the Island of Cozumel, 1885. 



ASPLENIUM, Linn. 

 A. pumilum, Swartz. 



On sandy loam under limestone ledge, Cedral, Island of Coz- 

 umel, Jan. 5, 1895 (35). 



Fronds taller than is usual, the upper portion more elongated 

 than in the type, and deeply pinnatifid to the acuminated apex, 

 with the lobes more or less deeply cut, but not laciniated. Quite 

 unlike in appearance the smaller normally deltoid forms with 

 entire, or nearly entire upper third, but otherwise the characters 

 are the same. The species, however, like all other Aspleneae, is 

 an extremely variable one, and the present form is no greatly 

 marked exception. 



Smaller plants with firmer texture collected at the same station 

 on the under side of a small projecting limestone ledge (36). 



'Determinations and notes of my numbers kindly made by Mr. Geo. E. Davenport. 



