MAXOX — STUDIES OF THOPICAL AMERICAN FERNS. 497 



tributed as ChclJanthcs pringlei, a uearly allied species described originally 

 from Arizona and since fonnd to range into northwestern Mexico, From C. 

 pringlei, however, the new species may be distinguished by the following obvi- 

 onw characters: (1) The slender pnrplish brown stipes, with fewer narrower 

 scales (not stout reddish brown stipes with copious chaff), (2) fronds narrowly 

 ovate (not short, trian;j;nlar or deltoid-oviite), (8) pinna^ spaced (not close- 

 set and overlapping), (4) primary and secondary rachises with sparse narrow 

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

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

 the under surface). The last character is in itself sufficient to indicate the 

 distinctness of C. pcninsularis, though the difference in shape of fronds is 

 almost equally pronounced, 



Diplazium delitescens :Maxon, sp, nov. Plate LVI, Figure 1, 



Khizome creeping horizontally^ 2.5 cm, long (incomplete), about 3 mm. in 

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

 haps somewhat abraded, inconspicuous, muiuLe, very dark, coarsely reticulated, 

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

 distichous by succession, 4o 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 tlattened 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 tlie base, broadly 

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

 largest, subopposite, 11 cm, long, 2 cm, broad, short-petiolate, patent, attenuate, 

 succeeding pinna* slightly smaller, ascending, adnate, the uppermost 1 or 2 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 plnnse lanceolate, 

 straight or slightly falcate, broadest near or below tlie middle, attenuate 

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

 cuueate, above subtruncate), the inner marghi straight and nearly paralk^I to 

 the raehis, subauriculate, margins els(^wliere regularly curvescent-serrate; mid* 

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

 3 or 4 times forked; sori elongate, 7 to 1) mm. long, narrow, slightly curved, 

 uniscrial, nearer the mldvein than the margin, borne on the first anterior 

 (simple) branch; indusia narrow, firm, 



Tyi)e in the U. S. National Herbarium, no. 403261, collected in the vicinity 

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

 Palmer (no. 34S), February, 1002. 



To be referred here also are the following: 



Honduras: San Pedro Sula, Department of Santa Barbara, altitude f?00 

 meters, 6\ Thivmc (ilistributed by John Donnell Smith, under no. 5G75, as 



^ 



isplcnivm cuJtrifoHum), (X) 



I'ANAiiA: i^. Haycx ". (X) 

 A most distinct species, especially remarkable for its peculiar marginal 

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

 I*rofessor Burgess. The form of the pinnie also is unconuuonly characteristic 



i 



and quile 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. 



A. cultrifolium Ti., which Christensen is probably correct in considering a 

 Diplazium, was founded on Plumier's plate 50, supposed to represent a plant 



