MAXON — STUDIES OF TROPICAL AMERICAX FERNS. 485 



PessopteHs Underw. & Maxoii, nom. nov.« 



Anaxetutn Scliott, (ieii. FiL pJ. L 1834. Not Anaxeton Gaert. Friict. 2: 400. 

 pL im. f. 10. ITUl. 



Fleuridhnn F6e, Gen. Fil. 273. 1S50-52. Not I'leuridium Bridel, Maut. Muse. 

 10. 1S19, 



The tyi}e and solo species is: 



Pessopteris crassifolia (L.) Undenv, & Maxon. 



Polfjpoffittm crcissifolium L, Sp. VL 1083. 1753. 



Aua.rctum crassifoJium Scliott Gen. Fil. />/. /. 1S34. 



rieuridium crassifolium Fee, Gen, FiL 274. 1850-52. 



(leuerally distribnted tlironiu^hont tropical America, and subject to consider- 

 able variation, several fonny having been described as distinct species. 



THE CUBAN SPECIES OF ADIANTOPSIS. 



Three species of Adiautopsis liave heen knoAvn hitherto from 

 Cuba. These are: 



Adiantopsis radiata (L.) Fee, Gen. Fil. 145. 1S50-52. 



Adiantum radiaium Ju Sp. PL 1094. 1758. 



Not uncommon througli troi)ical America generally. 

 Adiantopsis pedata (IIoolv.) Moore, Ind. Fil. 1^. 1S57. 



Hypolcpis pedata Hoolv. Sp. Fil. 2: 73. pi. .9,?. A, 1852. 



Known definitely from Jamaica and Cuba; accredited also to Peru. 

 Adiantopsis paupercula (Kunze) F^e, Gen, Fil. 145. 1S50-52. 



Adiantum paapcrcuhim Kunze, Farnl^r. 2: 65. pJ, 121, 1850. 



Known tally from Cuba and Jamaica. 



To these must be added a fourth very ditiereut species: 



Adiantopsis rupicola Maxon, sp. nov. 



Plant rijrid, 50 cm. high, fnmds several, closely clustered upon an ascending 

 woody rlilzume covered witti bright brown glossy linear cUaff with a darii me- 

 dian line; stipe 20 cm. long, naked, shining, puriUish brown; lamina 30 cm. 

 long, 10 to 12 cm. broad, deltoid-lanceolate, coriaceous, glabrous exceiH for a 

 few whitish club-shaped glandular hairs on the under surface, bii>innate or, as 

 to mature specimens, subtrlpinuate in the lower half; plunge subopi>ositts for 

 the most part nnequally deltoid-lanceolate with subhastate entire apices; basal 

 pinnte about 7 cm. long, 3 cm. broad at base, unerpially triangular, the two 

 lowest pairs of pinnules piimate, the inferior twice as long as the superior; 

 second and third pairs of piniue narrower, of similar but less i)ronounced 

 basiscopic d(n'elopment, only llie basal pair of pinnules again pinnate; succeed- 

 ing piume pinnate only (except for the pinnatifid basal pinnule), gradually 

 l)iun;ititid, Anally auricuhite and entire, tlie ui>iierm()st produced to form the 

 somewhat attenuate apex of the frond; pinnules at right angles-to the sec- 

 ondary rachis, cliaracteristic ones l)r(>adly elliptical to ovate, obtuse, somewhat 

 excised at the base below, auriculate; sori numerous, marginal, terminal on 

 tlie veins; indusia single (or I'arely double), spaced about half their width or 

 less, whitish, oblong to subrtMiiforni, reflexed at maturity to the plane of the 

 frond. 



Type in the U. S. National Herbarium, no. 372124, collected by William 

 Palmer and J. H. Riley (no. 242) in crevices of partially shaded limestone 



«From Greek Treaaov, a draughtboard (checkerboard) and Trrepis, a kind of 

 fern, in modern use any fern. 



