TAB CLXXVEHI. 
JAMESONIA PULCHRA. 
FILICES.—GxzaArz. Br.  PorvronpraczEz. Kaulf. Firiczs vere. JWilld. 
GEN. Cnan. JL4MESONLA Nobis. | Sori solitarii in medio pinnarum ad basin venarum inserti, 
pilis numerosissimis compressis immersi. Znvolucrum continuum, membranaceum, e margine 
retroflexo pinne, demum a capsulis remotum. Capsule subsessiles. Semina triangularia. 
Filix perpulchra, simpliciter pinnata, pinnis coriaceis subflabelliformibus. 
JAMESONIA pulchra. 
Has. In Monte Cayambe Peruvianorum : ad alt. 12,000 ped. legit et communicavit Clariss. 
Gul. Jameson, Professor. 
Stipes digitalis et ultra, erectus, flexuosus, primum, ut videtur, pilosus, demum glaberrimus, nitidus, atro-purpureus. 
Frons linearis, simplex, erecta, spithamza, parte superiore et juniore pilis fulvis densissime lanata, simpliciter pin- 
nata. 
Pinne 2—3-lneares, patentes, nonnunquam reflexse, breviter petiolatze, petiolo glaberrimo fusco, reniformi- 
flabelliformes, rigide, facie superiore convex:e, glaberrima, subradiatim et dichotome nervoss, nervis im- 
pressis, marginibus reflexis et ob nervos impressos crenatis, inferne pilis numerosis, fulvis, longis, compressis, 
articulatis tectee. — Fachis pilis fulvis intertextis dense obsita. 
Involucrum continuum e marginis inflexi portione pinnze, ut videtur, formatum, et nostris exemplaribus a capsulis 
remotum. 
Sori solitarii in singula pinna, ejusque basi inserta, versus apicem petioli, subglobosi, pilis immersi. 
Capsula. obovato-globosa, fere omnino sessilis, annulata, annulo fere completo cincta. 
Semina subtriangularia, angulis obtusis, pellucida, pallide flavo-fuscescentia. 
Fig. 1. Portio rachidis cum pinnis duabus. f. 2. Pinna sorifera, a dorso visa. f. 3. Involucri portio. f.4. Pili. 
f. 5. Capsule. f. 6. Semina:—magn. auct. 
The present highly curious Fern was communicated to us by Professor William Jameson of 
Quito ; and, being unable to refer 1t satisfactorily to any hitherto described genus, we have ventured 
to constitute a new one of it, which we dedicate to its discoverer, who is pursuing his scientific 
researches in South America with unabated zeal. The only specimens, however, which we have yet 
had the good fortune to receive are the two that are here represented, and the details are all that we 
can at this time offer. Individuals in a more or in a less advanced state might enable us to reform 
our generic character, which is by no means so satisfactory as we could wish. "The situation of the 
sorus, as we have hitherto seen it, is indeed very remarkable, and at such a distance from the invo- 
lucre that it scarcely seems to be connected with it; and yet, that the inflexed and dilated portion 
of the margin of the pinna is to be looked upon as a real involucre, analogy will scarcely permit us 
to doubt. 'lhis involucre resembles that of a Pzeris so much, that were the capsules inserted beneath 
it, we might have considered our plant to belong to that genus; although the curious fulvous hairs, 
which abound on this plant, and the whole habit, proclaim it to be entirely sui generis. 
