155 187 
San Domingo: WniGHT, Parry and BnuwMEL nr. 8 (W); H. von TünckHEIM nr. 2721 (B) — Haiti, 
near La Barriére Couchant, NasH and Tavron nr. 1075 (W) — JAEGER nr. 202 (W). 
Cuba: WnicHT nr. 923 (S, W) — Oriente, Santa Ana, north of Jaguey, Maxon nr. 4130 (W) — south 
of Jaguey, Maxon nr. 4169 (W) — Rio Seco, EccEns nr. 4726 (W) Mt. Liban, LINDEN nr. 
1904 (or 1901) (RB). 
In Haiti a form occurs, which is intermediate between D. serra and D. oligo- 
phylla; pinnz 1'/» em broad, incised about halfways into falcate, very acute seg- 
ments; in. texture and colour it comes nearest to D. oligophylla. 
Haiti: Picarpa nr. 1030 (C); Rio Bigothon, EcaGEns nr. 3308 (C) San Domingo, Rio Mameges et Rio 
Bajabonico, EccEns 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. 91'; 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. 3: 164; W. Ind. and Guiana Ferns 238. 
Dryopteris Sloanei O. Ktze. Rev. 2: 813. 1891. 
Dryopteris patens subsp. invisa 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. 
9': 24—25 I have dealt with the type-specimens of this species. 
hhizome 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. Rachis glabrous or more or 
less pubescent. Lamina 1—2 m long, membranous, chartaceous or coriaceous; 
pinne rather numerous, up to 5 dem 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 
pinne 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 coste 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 
smal], 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. 
