186 134 



Argentina: Misiones, Loreto, Ekman nr. 10 (Rg, S); Bonpland, Ekman nr. 11 iS) — Alta Graecia, 



Prov. Cordoba, Th. Stuckert nr. 2005 (C). 

 Paraguay: Arroyo Fogatingo-rai and San Salvador, J. D. Anisits nr. 2700 (B, W — a form of thinner 



texture and veins 8— 9 jugate). 



195. Dryopteris serra (Sw.) O. Ktze. Rev. Gen. PI. 2: 813. 1891; 



C. Chr. Ind. 291 pt. 



Syn. Polypodhim serra Sw. Prod. 132. 1788; Fl. Ind. occ. 1665. 



Aspidium serra Sw. Schrad. Journ. ISOO"-': 33. 1801; Melt. Asp. n. 226 

 (C. Chr. Ark. for Bot. D" : 34 fig. 9 et tab. 2 fig. 1, illustrating the 

 type-specimen). 

 Nephrodium serra Desv.; Bak. Syn. 289; Jenm. Bull. Dept. Jam. n. s. 

 :i: 164. 



Type from Jamaica leg. Swartz (S!). 



In its typical form a most distinct species characterized by its hard, coriaceous 

 texture, long and narrow pinnæ and a distinct terminal pinna. The type-specimen 

 belongs to a small form with a proportionally very long terminal pinna and only 

 6—8 pairs of lateral pinna, but the species grows much larger. The dimensions 

 of the largest specimen seen from Jamaica are: stipe 130 cm long, over 1 cm 

 thick at base, lamina about 1 m long, about 40 pairs of lateral pinnæ, which are 

 25 cm long by 8 mm wide, the terminal pinna 17 cm long; this large form does 

 not differ otherwise from the Swartzian type. — Rhizome creeping rather densely 

 clothed by hairy scales. Stipe and upper surface of the light-green lamina glabrous, 

 rachis deciduously and shortly puberulous by thin hairs, which are often furcate, 

 and very sparsely furnished with small scales. The very prominent stramineous 

 costæ and veins beneath rather densely woolly-pubescent and the costæ moreover 

 clothed by rather numerous, very narrow and thin ciliated scales. Pinnæ scaicely 

 reduced towards the base, sessile, the upper basal segment about 1 mm remote 

 from the lower one adnate to rachis, very acuminated towards the apex, regularly 

 and sharply serrated, most deeply at the middle. Teeth triangular, the edges 

 revolute, those of the lower part of the lower pinnæ often nearly obsolete. Veins 

 very close, prominent beneath, stramineous, 7 12-jugate, the lower 2 — 4 connivent 

 to sinus. Sori a little above the middle of the vein, furnished with a pale or red- 

 dish, setose, persistent indusium. 



D. serra differs from the related D. oligophijlla by its much narrower pinnæ, 

 coriaceous texture and the terminal pinnæ, the lower pinnæ are never reduced 

 towards the base in the same manner as in D. oligophylla, with which Mettenius 

 and Kuhn united it. The typical form is apparently confined to the larger islands 

 and both the small and the large form are found in all islands. 



I have seen the following specimens: 



Porto Rico, SiNTENis nr. 5826 (B, C, S, W), 5827 (C, W); Underwood and Griggs nr, ;i7 |W). 

 •laniaica, near Troy, Underwood nr. 2906 W) — Mt. Dialjolo, Maxon nr. 2330 (W) — Hart nr. 2;i2 

 (,W) — Hollymount, Underwood nr. 3460 iW) 



