135 187 



San Domingo: Wright, Parry and Brummel nr. 8 (W); H. von Tûrckheim nr. 2721 (B) — Haïti, 

 near La Barrière Couchant, Nash and Taylor nr. 1075 (Wl — Jaeger nr. 202 (W). 



Cuba: Wright nr. 923 (S, Wi — Oriente, Santa Ana, nortli of Jaguey, Maxon nr. 4130 (W) — south 

 of Jaguey, Maxon nr. 4169 (W) — Rio Seeo, Eggers nr. 4726 !W) — Mt. Liban, Linden nr. 

 1904 {or 1901) RBj. 



In Haïti a form occurs, which is intermediate between D. serra and D. oligo- 

 phylla; pinnae VI2 cm broad, incised about halfways into falcate, very acute seg- 

 ments; in texture and colour it comes nearest to D. oligophglla. 



Haiti: Picarda nr. 1030 (C); Rio Bigothon, Eggers nr. 3308 (C) — San Domingo, Rio Mameges et Rio 

 Bajabonico, Eggers nr. 2527 (C, CC. H. W). 



In Cuba and the Bahamas a form grows, which perhaps belong to D. serra, 

 but which I refer to D. augescens (see under that species). 



196. Dryopteris oligophylla Maxon, Contr. U. S. Nat. Herb. 10: 489. 



1908. — Fig. 25. 



Syn. Polypodium invisum Sw. Prod. 133. 1788; Fl. Ind. occ. 1672 (C. Chr. 

 Arkiv for Bot. 9"; 24 fig. 3. 1910). 

 Aspidium invisum Sw. Schrad. Journ. 1800-: 34. 1801 ; Mett. Aspid. nr. 211. 

 Nephrodium Sloanei Bak. Syn. 263. 1874; Jenman, Bull. Dept. Jamaica 



n. s. ;i: 164; W. Ind. and Guiana Ferns 238. 

 Dryopteris Sloanei O. Ktze. Rev. 2: 813. 1891. 

 Dryopteris patens subsp. inuisa C. Chr. Ind. 283. 



Aspidium serra var. incisum Mett.; Krug, Engl. Jahrb. 24: 118. 1897. 

 Type from Jamaica, leg. Swartz (S!). — In my paper in Arkiv for Bot. 

 1)" : 24 — 25 I have dealt with the type-specimens of this species. 



Rhizome wide-creeping finger thick, clothed with rather thick, dark-brown, 

 hairy scales. Stipites at distances of 5 — 6 cm, slightly scaly at base, glabrous or 

 finely pubescent, 1 cm thick, often over 1 cm high. Racliis glabrous or more or 

 less pubescent. Lamina 1 — 2 m long, membranous, chartaceous or coriaceous; 

 pinnæ rather numerous, up to 5 dein long, 3 — 4 cm broad, the lower ones scarcely 

 reduced, short-stalked, upper ones sessile, long acuminate, the lower 2—3 pairs 

 attenuated towards the base, incised to a narrow wing into subfalcate or oblique 

 entire, acute segments with acute sinuses between, the lower ones of the lower 

 pinnæ gradually reduced, those of the basiscop side abortive and often entirely 

 obsolete. Surfaces eglandulose, glabrous or more or less pubescent, especially on 

 the ribs; minute hairy scales are often to be found on the costæ beneath. Veins 

 15—20 to a side, simple, prominent beneath; the lower 2 — 4 run together to a 

 callose membrane, which often forms an apophysis beyond the sinus. Sori rather 

 small, about medial, furnished with large, persistent, glabrous or pubescent indusia. 

 This very large species is a near relative of D. serra, with which Mettenius 

 united it, but abundantly different from D. patens, to which Baker in Flor. bras. 



