68 16 
dine specimens. It is not fixed exactly in the centre; the sinus extends over the 
middle and reaches nearly a shallow sinus on the opposite side of the indusium, 
thus the indusium appears to be cleft into two halves. FÉr's figure (Gen. Fil. tab. 
23 B) gives a good illustration of an extreme form. A. BRAUN founded a new sec- 
tion Dichasium on this character (Flora 1841: 710), and F&e considered it being of 
generic value. I can not at all agree in this; in young specimens the indusium 
are of the common filix-mas type, but growing older it is cleft, before falling, in 
the said manner. Still it seems to be a good specific character. 
D. paleacea varies in size and colour of the scales but is otherwise fairly 
constant. It is apparently not rare in the Andes from Mexico to Peru and Bolivia; 
it is found at high mountains of Jamaica and Haiti, and again in Southern Brazil. 
The Hawaiian plant referred hereto, Lastrea truncata Brack., is scarcely identical. 
I have seen the following specimens: 
San Domingo: infra Valle nuevo, 1900 m., EcGERs nr. 2306 (B). 
Jamaica: Summit of Blue Mountain Peak, Maxon nr. 1411 (W = UnperRwoop nr. 2541); W. Hannis 
nr. 7486 (W); Hart nr. 670 (W). 
Mexico: Valle de Mexico, ScHAFFNER nr. 85 (B), HanrwEG nr. 570 (B), UnpE nr. 180 et 236 (B) — Forét 
de San Nicolas, BourGEau nr. 1041 (B, H, W) — Pico de Orizaba, LiEBMANN nr. 2393 (H) 
— Oaxaca, GarLEoTTI nr. 6348 (B = A. crinitum M. et G.) — EHRENBERG (B = A. paralle. 
logrammum Kze. — Hidalgo, Trinidad, Prince nr. 8750 (B, H, W) — Ixtaccihuatl, C. A. 
PunPus nr. 10 (W) — Oaxaca, Cerro de San Felipe, C. Gonzarri and V. GoNzaLEz nr. 530 
(W) — Chiapas, San Cristobal, CorriNs and DoyLe nr. 136 (W). 
Guatemala: Volcan de Agua, 33—3600 nr, Maxon and Hay nr.3712 (W) — Depart. Quiché, San Mi- 
guel Uspantan, 6000’, HEvpE et Lux, ed. Donn. Smiru nr. 3244 (W). 
Costa Rica: Foréts de Barba, Pirrrer nr. 1933 (B, W) — Cerro de Las Vueltas, PrrTIER nr. 10604 (W) 
— El Paramo, Pirrier nr. 10621 (W) — foréts de Copey, 2670 m, Tonpuz nr. 11800 (W) — 
J. J. Cooper (W). 
Panama, Maxon nr. 5275 (W). 
Colombia, Harrwee nr. 1512 (B) — Boqueron-Bogota, SrüBEL nr. 457 (B) — Bogota, KansTEN (B). 
-Venezuela, prov. de Pamplona, FuNck et Scuriw nr. 1372 (RB, L). 
Peru, Domsey (B), Ruiz (B, W), Agapata, LecHLER nr. 2020 (B). 
Bolivia, MaNpoN nr. 71 (B) — Tunari Mts., O. Kuntze (B) — M. BANG nr. 1784 (B, W). 
Argentina: Sierra de Tucuman, P. G. LonENTZ (B). 
Brazil: Rio, Graziou nr. 4432, 7333 (B, H) — E. Bruner nr. 53 (B) — Serra de Itatiaia, P. DusÉN nr. 
428 (Rg, W) — Theresopolis, TH. DE Moura nr.60 (B) — Minas Geraes, Caldas, Regnell nr. 
lI 1451 b (B, Rg, W); Mosén nr. 2180 (H, Rg). 
4. Dryopteris mexicana (Pr.) C. Chr. comb. nov. — Fig. 1. 
Syn.: Nephrodium mexicanum Pr. Rel. Haenk. 1: 38, 1825 (non auctt.). 
Aspidium flaccidum Fourn. Bull. Soc. Fr. 27: 328, 1880. 
Nephrodium Fournieri Bak. Ann. Bot. 5: 317, 1891. 
Dryopteris Fournieri C. Chr. Ind. 266, 1905. 
The type-specimen of this species was collected in Mexico by HarwkE. I 
have seen in Herb. Presi a single leaf labelled: *Nephrodium mexicanum Presl, 
rel. haenk. I: In Mexico (Heenke)”, which I regard as typical. It does not agree 
with the forms generally referred to D. patula v. mexicana, but it is not essentially 
