258 206 
costule. Sporangia with a few simple, deciduous sete or in some specimens glabrous. 
“In the early stage of growth trace of a rudimentary involucre is observable, 
which however soon disappears" (JENMAN loc. cit.). I have not found indusia. 
This species, of which the plate of Hk. Icon. t. 1669 gives a fair illustration, 
can be considered the type of a small group including the species nr. 257—261 of 
this monograph, which connect D. fetragona with D. Poiteana. From D. tetragona 
they differ by venation and less cut pinn:z, from D. Poiteana by few or no meni- 
scioid veins. The Central-American specimens of D. obliterata approach D. Poiteana 
more than the West-Indian ones, and they also resemble D. paucipinnata, from which 
they differ by position of sori, venation, texture and generally exindusiate sori. 
D. obliterata is confined to Jamaica, Cuba, Mexico and Northern Central- 
America. I have seen the following specimens: 
Jamaica: Swanrz (H, S); Maxon nr. 831, 1799 (= UNDERWoop nr. 2772), 1846, 1924, 2876 (W), 2375 
(C, W); UnpERWwOOD nr. 117 (W); CrLuTE nr.246 (W); Harr nr. 336 (W); O. Hansen (CC, H). 
Cuba: WnicnHT nr. 1010 (C, CC, S, W) Santiago, Pottarp and E. & W. PALMER nr. 96 (W) — Pinar 
del Rio, PALMER and RirEv nr. 72 (C, H, W), 251 (W) — Santa Catalina, CALDWELL and BAKER 
nr. 7028 (W) — Isla de Pinos: A.H. Cunriss nr. 345 (W); A. A. Tavron nr. 9 (W); PALMER 
and HRirEgv nr. 1040 (W). 
Mexico: Barranca de Jovo, LigBMANN (HB, P. faucium Liebm.) — ScHAFFNER (B) — Coatzacoalcos, 
isthmus of Tehuantepec, CHas. L. SurrH nr. 2052 (W). 
Guatemala: Puerto Barrios, MaxoN and Hey nr. 3059 (C, W) — Rio Dulce, DoNNELL SwrrH nr. 1559 
(W) — Livingston, KELLERMANN nr. 4856 (W) — Puerto Barrios, B. L. Ropinson nr. 472 (W) 
— near Cacao, H. S. BannEn nr. 186 (W). 
Honduras: Bonacca, GopMAN and SarviN (B) — San Pedro Sula, C. TniEME, ed. Donn. SurrH. nr. 5685 
(W); 5693 part. (B, not W). 
L 260. Dryopteris nigrescentia (Jenman) C. Chr. Ind. 279. 1905 — Fig. 44. 
Syn. Polypodium nigrescentium Jenman, Gard. Chron. III. 17: 100. 1895; 
Bull. Dept. Jam. n.s. 4: 132. 1897. 
Type from Jamaica, leg. JENMAN (W)). 
A doubtful species, of which I have seen 5 leaves only. It may be an ab- 
normal, local form of D. obliterata, which it resembles in the essential characters. 
It differs by the stouter rhizome, smaller leaves (10 cm long and broad at base), 
dark-green colour, wrinkled, serrulate, opposite and sessile pinnz, and shortened 
often rudimentary terminal pinna. Veins 4—5 to each side, the lowest 2—3 pairs 
anastomosing. Sporangia glabrous. Rachis more conspicuously stellato-puberulous. 
261. Dryopteris Rolandii n. sp. — Fig. 45. 
Ecuador: Rio de Ventanas prope Guayaquil, leg. SPRUCE nr. 5718 (type in RB). 
Rhizomate? Stipitibus validis, brunneo-stramineis, supra trisulcatis, 6!/» dem 
longis, ubique dense stellatim puberulis ad insertionem sparse squamosis; pilis bre- 
vissimis 3—6 furcatis, squamis angustis pilis stellatis dense instruclis. Lamina 
4 dem longa, pinnata cum impari, herbacea, pure viridi; rachi tenui stellatim pilosa; 
pinnis 7-jugis, suboppositis vel superioribus alternis, sessilibus, inter se 5—6 cm 
