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502 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Tlir alliaiico of l\ prontUtuhi in outline luul venation is rather with the well- 

 known /*. li/copodioides, from wliicli it differs not only in its more conforn. 

 fronds hut also in- its raised venation, sli^^hter rhizoiuo and more translucent 

 tissue. 



Polypodium dissiniulans Maxon, sp^ nov. 



A very delicate i>endent plant with numerous flaccid linear fronds; rhizome 

 erect, minute, slender, 1 to 1.5 mm, hi diameter, bearhi^ a few relatively lari^e 

 brii^^ht brown huiceolate scales, with dark cell walls; fronds 15 to 20 cm. ]<»n^% 

 to 12 mm, broad, scarcely sti]>itate, greatly rt^duced below, the rachis (iliform, 

 dark browu or blackish, bearinj,^ 45 to 00 pairs of distant narrow alternatt^ 

 pinn;e. decreasing gradually toward the apex or sometimes abruptly ii^ a 

 narrow torniinal caudate segment 2 cm. long, 2 nun. broad at the base and 

 there coarsely lobed; pinnae separated once or twice their width, adnale, 

 smooth, membranous, translucent, the lowermost minute, decurrent, distant 

 Jess than 1 cm. fn>m the rhizome, those imme<liately above gradually larger 

 and with simple midveins; cliaracteristic pinna^ (> nun. long, UT-") una.- broad 

 above the base, strongly decurrent, lanceolate, straight or slightly recurved, 

 borne obliquely (usually at an angle of al>uut 4o°), marguis with a few sliallow 

 dentate serrations, apex st>mewhat produced, subentire, obtuse, midveins dark, 

 flexuose, with about 4 or 5 pairs of oblique alternate veins extending half 



way to the margin and corresponding to the oblique marginal teeth; sori large, 

 slightly inq)ressed, conflu(Mit witli age, terminal ui>ou tlie veins. 



Type in the herbarium of Capt. John Donnell Smith; collected from tree 

 trunks near Col)an, Alta Veraj»az, (Uiatemala, at an altitude of 1,300 meters, 

 February, 1886, by XL von Tiirckheim, The collection including this was dis^ 

 tributcd by Captain Smith as no. 884, Polypodiitm juhacfortne Kaulf. A 

 specimen of this number hi the U. S. National Herbarium is less complete. 



The present species is n^adily distinguislunl fn^m /'. juhacfonne by its exceed- 

 ingly delicate texture, very slender vascular parts, almost superficial sori, and 

 toothed piniue, tln^ last a character urtted by Captain Smith. The relation- 

 ship is rather with tlie llritish (iuianaii P. mclonotrichian Baker « and the 

 closely allied ]\ sifprasculptum Christ,^ the latter described recently from 

 C(»sta liica. From these it differs notably hi its very narrow fronds and few 

 shallow blunt teeth. 



Stenochlaena latiuscula Maxon, sp. nov. 



Kootstock wide-creeping, flattened, aljont 7 nun, broad, 3 to 4 mm. thick, . 

 naked or nearly so, bearing a few naked dark yellowish brown laiiceolate 

 scales at the base of the stipe and extending ut» the stipe a short distance {11 

 to 4 cm.)' Sterile frond dark green, about 70 cm. long; stipe 20 cm.; lamina 

 exactly lanceolate, at the base truncate, 50 cm. hmg, 25 cm. broad at the middle 

 and at tlie base, about 17-jugate, the pinnie 12.5 cm, long by l.G to l.S cm. 

 broad, simple, lineai--lanceo]ate, subopposite, spaced about their width, borne at 

 90" to ihe stout terete very uarro\A"ly alate rachis, sliort-petiolate, sul)equa]ly 

 and rather obtusely cuneate, tapering gradually from near the middle to an 



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evenly long-attentuate straight or slightly falcate ai)ex, the margins evenly 

 crenulate revolute in drying ; veins conspicuous, simple or more commonly 

 once-forked at or near the base, diverging from the costa at an angle of about 

 70°; intercostal spaces about S to 1 cm. Fertile fronds similar )>ut smaller, 

 about ]3-,iugate, the rachis fibriilose-cha ffy ; i»iun:e linear, 10 to 11 cm. long. 



«Timehri II. 5: 210. 1S8G; Trims. Lhm. Sor. II. Kot 2: 21>2. 1S87. 

 ft Bull. Herb. Hoiss. 11. 5:;^ 11»05. 



