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10 FIELDIANA: BOTANY, VOLUME 28 Type in herb. Chi. Nat. Hist. Mus., no. 1,205,046, collected on forested south-facing slopes overlying sandstone, on "Cave Rock" above "Cave Camp", Ptari-tepui' state of Bolfvar, alt. 1810 m., Oct. 29, 1944, Julian A. Steyermark 59481. In its small size and contracted fertile blades //. minima is unlike any species with which am I acquainted. The large and conspicuous indusium suggests that of Cyathea, but it is incomplete. Seemingly the inflexed concave margin of the segments functions somewhat as an indusium, protecting the sori while they are young. The type specimen is a unicate. It may represent a somewhat depauperate phase due to exposed conditions. ilemitelia amabilis Morton, sp. nov. Caudex 0.9 m. altus, 5-7.5 cm. diam.; folia erecta, ca. 1 m. longa; stipites inermes, breves, ca. 20 cm. longi, 5-8 mm. diam., canaliculati juventute puberuli, demum subglabri, perspicue paleacei, paleis lucidis, albidis, chartaceis, peltatis, anguste triangularibus, 6-10 mm. longis, 3-4 mm. latis, erosis; laminae lanceolatae, subabrupte acuminatae, medio ca. 30 cm. latae, pinnato-pinnatifidae, rhachi incurvo-puberulae, subtus paleis albidis, ovatis, 4-7 mm. longis praedita; pinnae ca. 20-jugae, patentes, lanceolato-ligulatae, longe acuminatae, maximae 17 cm. longae et 3.2 cm. latae (inferiores minores et deflexae), pinnatifidae, ala costalis ca. 2 mm. lata, costis costulisque supra glabra (basi excepta), subtus strigillosis, paleis albidis, subbullatis sparse praeditis; segmenta 15-20-juga, late oblonga, subfalcata, 14-18 mm. longa, 5-6 mm. late, rotundata, integra, margine paullo revoluta, utrinque subglabra; venae liberae, 9- vel 10-jugae, omnes sub medio furcatae; sori saepe 6-jugi, basi rami anterioris venae positi, rotundi; indusia ampla, tenera, semicupuliforrnia, brunnea, ca. 0.9 mm. lata, glabra, suberosa; receptaculum magnum, ca. 0.25 mm. latum, globosum; paraphyses nullae. Type in the U.S. Nat. Herb., no. 1,915,330, collected at El Paramo, northeast of Las Delicias, northeast of Caripe, state of Monagas, alt. 1200-1450 m., April 13, 1945, Julian A. Steyemark 62042; isotype in herb. Chi. Nat. Hist. Mus. The most nearly related species is evidently H. chiricana Maxon (sect. Cnemidaria) of Panama, which is closely similar in cutting and venation, but the scales of stipe and rhachis are quite different, those of //. chiricana being dark castaneous or blackish with paler borders, whereas those of the present species are white throughout. POLYPODIACEAE Thelypteris brachypoda (Baker) Morton, comb. nov. Nephrodium brachypodum Baker, Timehri 5: 213. 1886; Trans. Linn. Soc. London II. Dot. 2: 290. 1887. "Ene-bi-gi-yek tinmnga-teng (remedies chiquitos para bichos)".
BOTANICAL EXPLORATION IN VENEZUELA - I 11 On rocks along stream tributary to Rio Kukenan, Gran Sabana, in woods at base of Mount Roraima, state of Bolivar, alt. 1185-1280 m., Steyermark 58588. This characteristic species has apparently been known from the original collection (Mt. Roraima, 1m Thurn 275, isotype US). It is with a good deal of regret that I have finally decided to recognize some of the segregates from Dryopteris. It seems to be generally conceded that the comprehensive genus as currently maintained is composed of several diverse elements, and Holttum in his recent paper "A Revised Classification of Leptosporangiate Ferns" (Journ. Linn. Soc. London 53: 123-158. 1947) goes so far as to put Thelypteris in a different family from Dryopteris. Such a drastic procedure does not seem necessary to me; in fact, I find it hard to believe that these two groups are not at least somewhat related. However, it does seem possible to define them adequately, and since the inclusive Dryopteris is uncomfortably large, there is a definite advantage in segregating it. Cope land, in his useful Genera Filicum (1947), recognizes several genera, such as Cyclodium, Stigmatopteris, Ctenitis, Lastrea, Currania, Meniscium, Goniopteris, and Cyclosorus. At the present time I prefer to recognize one small aberrent group as Gymnocarpium and three large genera: Dryopteris (including Cyclodium, Stigmatopteris, arid Polys tichopsis), Ctenitis (including P arapolystichum), and Thelypteris (including Goniopteris, Meniscium, Cyclosorus, Glaphyropteris, Steiropteris, and I.eptogramma). Cope land's adoption of the later name Lastrea instead of Thelypteris is unfortunate. He rejected Thelypteris because the publishing author, Schmidel, did not adopt the Linnean system of binary nomenclature, but that provision of the International Rules (Article 68, sect. 4) affects only specific epkhets and not at all generic names. Thelypteris Engelii (Hieron.) Morton, comb. nov. Dryopteris Engelii Hieron. Hedwigia 46: 339. pi. 6. fig. 12. 1907. Terrestrial, fronds 3 or 4, ascending; southwest-facing forested slopes between Rondrfn Camp and base of sandstone bluffs, Mount Roraima, state of Bolivar, alt. 2040-2255 m., Steyermark 58992. The identification is not certain. The original collection, of which no material is available for consultation, was from Menda, Venezuela (Engel 90). Thelypteris pilossissima Morton, sp. nov. Rhizoma breviter repens, crassiusculum, paleaceum, paleis brunneis, lanceolatis, usque ad 6 mm. longis et 1.5 mm. latis, attenuates, concoloribus, integris, margine pilis paucis simplicibus gerentibus; folia pauca, 18-20 cm. longa, breviter stipitata, stipitibus curvatis, 5-7 cm. longis, ca. 1 mm. diam., paleis minutis hinc inde praeditis,
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