MAXoN — STUDIES "I" TROPICAL AMERICAN FERNS'. 497 



tributed as OheUanthes pringlei, a Dearly allied Bpeelea described originally 

 from Arizona and since found to range Into aorthwestern Mexico. From < . 

 pringlei, however, the oew species maj be distinguished by the following obvi- 

 ous characters: (1) The slender purplish brown stipes, with fewer aan 

 scales (nol Btout reddish browu stipes with copious chaff), (2) fronds narrowly 

 ovate (nol short, triangular or deltoid-ovate), (3) pinna? spaced (nol 

 set and overlapping), i i) primary and secondary rachisea with Bparse narrow 

 yellowish brown scales (not with very numerous broad whitish scales extending 

 thickly even to the vascular pans of the pinnules and commonly obscuring 

 the under surface). The last character la In Itself sufficient to indicate the 

 distinctness of C. peninsular is, though the difference in shape of front 

 almost equally pronounced. 

 Diplazium delitescens Maxon, Bp. nov. Plate LVI, Figure 1. 



Rhizome creeping horizontally. 2.5 cm. long (incomplete), aboul •"; mm. in 

 diameter, covered thickly with distichous stipe-bases; scales of rhizome per- 

 haps somewhat abraded, Inconspicuous, minute, very dark, coarsely reticulated, 

 brittle, elongate-triangular, acuminate, closely appressed; fronds borne singly, 

 distichous by succession. 43 cm. long, arcuate; stipe 21.5 cm, long, at the base 

 thickly clothed with brownish lanose hairs intermixed with a few scales like 

 those of the rhizome, conspicuously flattened laterally, the anterior face con- 

 cave, the posterior convex, thus in section narrowly hippocrepiform, vascular 

 bundles two; lamina 21.5 cm, long, about 20 cm. broad at the base, broadly 

 deltoid-ovate; pinn.e about 7 pairs, firm, membranaceous, the lowermost the 

 largest, subopposite, 11 cm. long, l' cm. broad, short-petiolate, patent, attenuate. 

 succeeding pinnae slightly smaller, ascending, adnate, the uppermost 1 or - pairs 

 abruptly reduced, rounded or even retuse at the apex, giving rise to a sub- 

 hastate, caudate terminal segment (about 8 cm. long), this shallowly lobed 

 below, toward the apex obliquely serrate: characteristic pinna- lanceolate, 

 straight or Slightly falcate, broadesl near or below the middle, attenuate 

 (casually elongate), at the base unequally cuneate-truncate (below narrowly 

 cuneate, above subtruncate), the inner margin straight and nearly parallel to 

 the rachis, subauriculate, margins elsewhere regularly curvescent-serrate ; mid- 

 veins prominent nearly throughout on the lower side, the veins mostly apparent, 

 :; or 4 times forked; sori elongate, 7 to 9 mm. long, narrow, slightly curved, 

 uniserial. nearer the midvein than the margin, borne on the first anterior 

 (simple i branch; indusia narrow, firm. 



Type in the V. S. National Herbarium, no. 403261, collected in the vicinity 

 of San Luis, province of Oriente, Cuba, by Charles L. Pollard and William 

 rainier (no. 348), February. 1902. 



To be referred her*' also are the following: 



Honduras: San Pedro Sula, Department of Santa Barbara, altitu.de :;<>n 

 meters, r. Thieme (distributed by John Donnell Smith, under no. 5675, as 

 Asplenium cultrifolium) . (N) 

 Panama : >. //•///> 8 57. I N I 



A most distinct species, especially remarkable for its peculiar marginal 

 cutting which is best described as curvescent-serrate, a term used recently by 

 Professor Burgess. The form of the pinna- also is uncommonly characteristic 

 and quite unlike that of any of the smaller American species of Diplazium. 

 The type specimen shows only an occasional diplazioid SOrus; but the Hon- 

 duras specimen Cited has the sori more numerous, freely diplazioid, and ex- 

 tending rather closer to the margin. 



.1. cultrifolium L., which Christensen is probably correct in considering a 

 Diplazium, was founded on Plumier's plate ..«.». supposed to represent a plant 



