324 78 



Type from Guatemala: Cubilquitz, leg. Türckheim ed Donnell-Smith 

 n. 8357 (HC!). 



Costa Rica: Valle del Rio Navarro, C. Wercklé (HC).— Cartage, H. Polakow- 

 sky n. 444 (HB). — San José, 1169 m., P. BioUey 1906 n. 104 (HC). 



? Mexico: S. Christobal, L. Munch (HC). 



In its most marked form this species from ils habit can very well be 

 distinguished from the others of this group, but I have seen several intermediate 

 forms between it and D. Mercurii. The typical form is very characteristic by its 

 leaf narrowing gradually through a long row of reduced pinnæ, the lowermost of 

 which are auriculiform, and further by its very regularly placed, horizontal, as 

 a rule opposite pinnæ, which are very finely pubescent but eglandulose on the 

 underside; rachis sparsely furnished with deciduos, soft, whitish hairs. Veins only 

 10 to 12 to a side. Texture rather thin, but firm. 



73. Dryopteris rudis (Kze.) C. Chr. Ind. 289. 1905; Hieron. Hedwigia 

 46: 336. 1907 - [Fig. 48]. 



Syn. Polypodium rude Kunze, Linnaea 13: 133, 1839; Bak. Syn. 307. 1867; 

 Phegopteris riidis Mett. Fil. Hort. Lips. 83. 1856. — 1 Polypodium ctenoides Jenm. 

 Bull. Dept. Jamaica 4: 129. 1897; Dryopteris ctenoides C. Chr. Index 260. 1905, an 

 Polypodium ctenoides Fée, 11 mém. 54 tab. 14 fig. 2. 1866? — On Alsophila pilosa 

 Mart. & Gal. Foug. Mex. 78 tab. 42. 1842, by most authors referred to D. rudis, see 

 under D. pterifolia. 



Type from Mexico, leg. Schiede (non vidi). 



Of this species I have seen a specimen, determined by Kunze, from Vene- 

 zuela, prope Chacao, E. Otto n. 612 (HB), which I take for the true D. rudis: with 

 it some specimens from Mexico, leg. Liebm.ann (HH.), agree very well. 



D. rudis is a member of the group of D. Sprengelii, but very often misunder- 

 stood by the pteridologists, probably because Baker in Syn. Fil. describes the species 

 as having a lamina with the lowest pinnæ not reduced. It is the typical species 

 of a long row of andine species, well-marked by their size and as a rule very hairy 

 rachis and other vascular parts. 



D. rudis has a strong, grayish, glabrous or deciduously pubescent stem, which 

 apparently is long, up to 3 dem., but as a fact it is very short, the lamina down- 

 wards being abruptly much narrowed; the lower 6—7 pair of pinnæ are reduced 

 to mere glands or warts with spaces of 4 cm. between two pairs; they are very 

 inconspicuous, and the lower part of the rachis, therefore, can be mistaken for the 

 upper part of the stem ; above these glandlike pinnæ are one or two pair of abbre- 

 viated, reflexed pinnæ; the shape of the lamina thus agrees with the typus IV, its 

 length reaching 1 m. Developed pinnæ numerous, alternate, acuminate, 15 — 20 cm. 

 long by 3 cm. broad with an acute aërophore. Rachis angular, trisulcate and 

 densely ochraceo-tomentose above, convex and less hairy beneath. Both surfaces 

 along the costæ and veins shortly hispido-pilose, between the veins furnished with 



