110 58 
Type from Ecuador, Chimborazo, Spruce sine num. (Kew!). 
Stipe 35 em long, !/» cm thick, trisulcate above, throughout (at base densely) 
fibrillose by narrow, lanceolate, hair-pointed, toothed, brown, glossy scales. Lamina 
bipinnatifid or subbipinnate, 60—70 cm long, grass-green, firmly herbaceous, finely 
pellucido-punctate; rachis fibrillose like the stipe and densely brown-tomentose 
above by short, articulated hairs. Pinnz 12—15 cm long, 3'/2—4 cm broad, short- 
stalked, the lower ones not reduced; upper surface glabrous, the coste and basal 
part of the costule excepted, which are densely setose by antrorse, subulate, arti- 
culated hairs; costze and costule beneath rather densely pubescent by patent, short 
subulate hairs, which are unicellular or consisting of two or rarely three cells, 
lower part of coste fibrillose by narrow, brown, hair-like scales, leaf-tissue minutely 
pubescent by very small hairs. Pinnz incised nearly or the lower ones quite to 
the rachis into close, patent, obtuse, entire or shallowly crenated segments, 6 mm 
broad; basal segments reduced. Veins distant, rather indistinct, 7—8-jugate, most 
of them forked with the branches not reaching the margin but terminating in a 
hydathod which is seen on the upperside within the edge as an oblong, pale- 
brown dot. Sori small, on the middle of the anterior branch of the forked vein, 
exindusiate, HookER says (l. c. 107): *involucre minute but apparently persistent 
reniformi-rotundate"; in the original specimen the sori are young and only a few 
of the sporangia developed; the receptacle bears rather many short, reddish, arti- 
culate hairs, which in the dried plant may be mistaken for a small indusium. 
A very distinct species of uncertain relationship. It differs from the following 
species by its colour and especially by its upper pinne, which are not broadly 
adnate to rachis with the lower basal segments decurrent. 
51. Dryopteris platyloba (Bak.) C. Chr. Index 285. 1905. — Fig. 11c. 
Syn. Polypodium rotundatum Hk. spec. 4: 238. 1862 (non Willd.). 
Polypodium platylobum Bak. Syn. 307. 1867. 
Polypodium biseriale Bak. Syn. 309. 1867, pro parte’ 
Polypodium tarapotensis Bak. Syn. 505. 1874. 
Dryopteris tarapotensis C. Chr. Ind. 297. 1905. 
Type from Peru, Tarapoto, Mt. Guayrapurima, Spruce nr. 4656 (Kew!, 
also RB). 
In Syn. Fil. Baker cited Spruce nr. 4656 as type-number for his three species 
quoted above. I have the original-specimens of all three species for examination 
from Kew Herbarium, and I come here upon an instance of species-making, which 
fortunately is rather uncommon. Certainly the three specimens are not quite 
identical, that of P. platylobum being bipinnatifid with entire segments while the 
two others are bipinnate below with lobed segments, but the former specimen is 
only a smaller leaf of the same species of which the other two are a more deve- 
loped state; there is not the slightest difference to find between the specimens as 
