I Krnm the Hiu.lbtin ofihrTokkry Hoiankai. Cl.UH, 40: 183-185. //. 3. 9 May 1913.] 



New ferns from tropical America — II 



Margaret Slosson 

 (with plate 3) 



The two species of Dryopteris here described for the first time 

 belong to the group of D. pubescens. Both are from Jamaica, 

 and each bears a most curious and misleading resemblance to the 

 other. 



For the privilege of describing the first I am indebted to the 

 kindness of Mr. William R. Maxon. This species is based on a 

 single sheet, representing a rootstock and three leaves, two de- 

 tached, originally from the Jenman Herbarium, labelled Nephro- 

 dium laridum Jenman, in Jenman's hand. It may be described 

 as follows: 



Dryopteris lurida (Jenman) Underwood & Maxon sp. nov. 

 Nephrodium luridum Jenman MS. 



Rhizome creeping, furnished with blackish rigid lanceolate or 

 lance-linear acuminate scales up to 6 mm. long, with occasional 

 unicellular gland-like processes and jointed cilia on their margins; 

 similar scales on bases of the stipes; fronds clustered, pubescent, 

 glandular throughout with capitate, often long-stalked and jointed, 

 sometimes forked glands; stipes slender, up to 31.5 cm. long, dark 

 brown at base, upwards brownish or stramineous or greenish, 

 grooved on face; laminae up to 25 cm. long, up to 16.5 cm. broad, 

 green, tinged with olive, ovate-deltoid, tripinnate, abruptly nar- 

 rowed above at about the third or fourth pair of pinnae, their 

 apices acute or acuminate, serrate, giving rise gradually to the 

 pinnae and pinnules; pinnae alternate or opposite, oblique, 

 stalked, mostly asymmetrical, those above the basal mostly 

 ovate-lanceolate to oblong-lanceolate, the second or third pair often 

 subequilateral, those above somewhat cut away beneath at base, 

 the basal pair broadly deltoid or ovate-deltoid, up to 9 cm. broad 

 at base, its inner inferior 2-5 pinnules on either side much longer 

 than the corresponding superior ones and sometimes subbipinnate 

 at base; other pinnules parallel with or overlapping the costa on 

 the inner side, somewhat cut away beneath at base, acute, the 

 larger stalked and obliquely pinnatifid into serrate or entire lobes, 



183 



