MAXON -STUDIES OF TROPICAL AMERICAN FERNS. 501 



cm. Long), simple, linear, long-attenuate, straighl or nearly bo, gradually taper- 

 ing from the unequally subcordate base < v to 10 nun. broad), the lowei 

 Bhort-stalked (2 to •"'. mni.), the middle ones less s<». the upper sessile, the ter- 

 minal segment 7..". cm. long, conform, sessile; costa evidenl throughout; veins 

 concealed, close, 2 or '■'> times dichotomously forked, extending to the thick 

 whitish narrowly cartilaginous margin; margins broadly revolute, the 

 borne In a continuous broad band from the free mucronate tip of ih<' pinna 

 nearly to the base on both sides. 



Type in iii«' I', s. National Herbarium, no. ~>1---'-',, collected by l>r. Edward 

 Palmer, near Victoria, altitude about :'>•_'•> meters, State of Tamaulipas, Mexico, 

 February to April, 1907 (no. 234). Only one specimen was found, this fortu- 

 nately in lt< »< »* I condition. 



The long, simple, entire, spaced pinnae will distinguish Pcllaca notabi 

 once from any known species of the group characterized by light-colored stipes 

 and rachises. 

 Phymatodes prominula Maxon, sp. nov. 



Rhizome extensively creeping, slender, 1.5 to _' nun. in diameter, thickly 

 covered with appressed ferruginous firm lanceolate scales terminating in a long 

 seta, the margins lighter-colored with flaccid deciduous cilia; fronds essentially 

 conform, exstipitate, coriaceous, glabrous, entire, 7 to L2 cm. long, n to 15 nun. 

 broad, linear-lanceolate to oblanceolate, the apex subobtuse or acutish (rarely 

 attenuate), the lower portion gradually attenuate to the base, thus narrowly 

 cuneate; principal venation manifest, the costa and lateral veins elevated, the 

 connecting and included veinlets scarcely so or immersed; in sterile fronds the 

 costal areoles narrow, tin' paracostal larger and extending nearly to the margin; 

 in the fertile fronds the costal aud paracostal areoles of nearly equal size, the 

 hitter soriferous; recurrenl Included veinlets few, short, immersed; ultimate 

 venation comprising a minor third row of incomplete areoles near the margin; 

 sori solitary, medial. Is to 23 pairs, impressed, borne ;it the end of a single 

 branch or at the ends of two branches short-excurrent from the costal ar< 

 spores light yellowish brown, muricate; paraphyses filiform, flaccid. 



Type in the CJ. s. National Herbarium, no. 531952; collected on the San Juan 

 trail, island of Margarita, Venezuela, altitude 500 meters, by J. R. Johnston 

 (no. 155), July <;. 1903. Represented also by Fendler's no. 50 from Trinidad 

 and by specimens collected by Charles Wrighl at Greytown, Nicaragua (without 

 number > . 



This is one of the forms usually called Polypodium salicifolium Willd., with 

 which species as delimited by Mettenius 6 it may be identical; but this name, 

 though used recently by Hieronymus, c is not tenable, having been used by Vahl 

 for another species in 1m>7. < if the several supposed synonyms associated with 

 " salicifolium" as a species or as a subspecies of lycopodioides none appears to 

 be available. Polypodium surinamensi Jacq., d as interpreted bj landman.' 

 differs in all essential respects, as dors also Craspedaria grandis Fee. Both 

 of these have dimorphic fronds. Polypodium dictyophyllum Kunze, from 

 Guiana, is from description clearly a distinct species, as recognized by Met- 

 tenius. 1 /'. rosmarinifolium Kunth is an allied Ecuadorean plant whose char- 

 acters have recently been pointed out by Hieronymus." 



■ Sp. PI. 5: l 19. 1810. 



''Ahhand. Senck. Nat. Gesell. 2:96. L856. 

 c Engler's Bot. Jahrb. 34:536. L905. 

 ''Coll. Bot. 3: 285, pi. 21. f. ',. 1789. 

 ' Ark. Bot. 1:247. 1903. 

 Crypt. Vase. Bres. 1: 1 19 pi. 37. f. .'. 1869, 



