76 
Species D. squamosissimae (Sod.) C. Chr. proxime affinis, divisione, textura, 
colore, rachibus dense paleaceis cum eadem congruens, differt autem paleis omnibus 
rigidis, lanceolatis, castaneis, integerrimis, parvioribus rufescentibus deficientibus, 
lamina utrinque dense et molliter longe pilosa, soris medialibus. 
his is in general habit and shape of tertiary pinnules scarcely to be distinguished 
from D. squamosissima, but it differs considerably in pubescence. The strong stipe is 
throughout like the primary and secondary rachises especially towards the base 
densely paleaceous by black-brown, rigid, fully entire, lanceolate scales, the largest 
of which are 3 cm long 3 mm broad; all the larger scales are patent, but under 
them are found some smaller but also lanceolate-castaneous, adpressed scales and 
some few rufous hairs. Lamina 1 m long, ovate; basal pinnze 30 cm long, a little 
shorter than those of the following pair, the lower side the larger at the lower 
third; the basal basiscopic pinnula is about opposite to the third acroscopic one; 
the basal acroscopic pinnula is the shortest. The cutting of the lamina does not 
differ from D. squamosissima, but it is on both sides throughout densely pilose by 
articulated, crisped, long hairs, the margins densely ciliate. Costule beneath with 
scattered linear, black-brown fibrils, very different from the broad, rufous scales of 
D. squamosissima, The medial or supramedial sori are apparently exindusiate, by 
which character our new species differs from D. andicola, which it resembles very 
closely in colour, pubescence and scales, and if not a real, valid species, it is more 
probably a large, exindusiate form of D. andicola than a pilose form of D. squamosissima. 
334. Dryopteris Karsteniana (KI.) Hieron. Hedwigia 46: 348. 1907. 
Syn. Polypodium Karstenianum Kl. Linnaea 20: 390. 1847. 
Phegopteris Karsteniana Mett. Pheg. 30 no. 63. 1858. Fil. Lechl. Il. 27; Karsten, 
Columb, 2: 97 tab. 150. 
Nephrodium villosum var. Karstenianum Jenman, Bull. Dept. Jam. n.s. 3: 104. 1896. 
Dryopteris. subincisa *Karsteniana C. Chr. Ind. 295. 1905. 
Polypodium barbatum Desv. Prodr, 242. 1827 (non Spr. 1827) ex descr. 
Phegopteris hirsuta Fée, Gen. Fil. 248. 1852! 
Aspidium erythrostemma Christ, Bull. L’Herb. Boiss. Il. 4: 961. 1904! 
Dryopteris erythrostemma C. Chr. Ind. 263. 1905. | 
Type from Venezuela leg. Karsten Coll. Il. nr. 3 (B!). 
A mighty species, perhaps the largest species of the genus, according to Kar- 
STEN, who has given a detailed description and illustration of it, to which I refer, 
a true tree-fern with a trunk up to 2 m high and 1 m thick bearing at its top 
8—10 leaves in a crown. Bases of stipes are densely coated with long reddish- 
brown, soft palez, very similar to those of D. nemophila. Leaves 2—3 m long, 
pinne up to nearly 1m long; pinnules. up to 15cm long, though generally shorter, 
often terminating into a long-acuminated, serrate apex. In cutting and pubescence 
it resembles closely D. villosa, but it is exindusiate. From D. subincisa it differs 
greatly by its dense pubescence, while its scales are less different. KaRSTEN describes 
