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16 FIELDIANA: BOTANY, VOLUME 28 Dicranopteris Schomburgkiana (Sturm) Morton, comb. nov. \ Mertensia Schomburgkiana Sturm in Mart. Fl. Bras. 1 : 233. 1859. Fronds with branches horizontally spreading, the segments gray on older fronds below, ferruginous on younger ones and on young stems; ascent of ledge along southwest-facing side, Mount Roraima, alt. 2100-2255 m., Steyermark 58778. The type came from Mt. Roraima (Schomburgk 1671, fragments in U.S. Nat. Herb, and N.Y. Bot. Gard.), and the species has probably not been found since, so the present collection is noteworthy. This species has been considered the same as Dicranopteris rufinervis (Mart.) Ching of Minas Gerais, Brazil, which Posthumus calls Gleichenia linearis var. rufinervis. Martius* description is too brief to be conclusive, but Gleichenia Klotzschii Hook., which is considered to be the same as rufinervis, is obviously distinct from D. Schomburgkiana. A comparison of fragments of the type of G. Klotzschii with the new specimens collected by Steyermark shows that the differences enumerated by Sturm hold true.
BOTANICAL EXPLORATION IN VENEZUELA - I 17 Thrasya setosa Swallen, sp. nov. SPERMATOPHYTA GRAMINEAE 4 Perennis; culrai graciles erecti, raraosi, glabr-i, nodis inferioribus barbatis; vaginae internodia aequans, carinatae, pilosae vel papilloso-pilosae, suprema elongata, glabra, marginibus papilloso-ciliata; ligula raembranacea, erosa, 1.5 mm. longa; laminae planae, 10-30 cm. longae, 2-3 mm. latae, attenuatae, pilosae, marginibus papillosohispidis; racemi terminales et axillares, solitarii, 8-12 cm. longi basi dense pilosi, rachi 1.8 mm. lata, papilloso-ciliata, pilis 2-5 mm. longis; spiculae 3 mm. longae; gluma prima obsoleta, gluma secunda plana, 5-nervis, acuta, scabra, summo marginibus hispida; lemma sterile gluma secunda paulo brevior summo 2-carinatum, carinis hispido-ciliatis; fructus 2.4 mm. longus, 0.7 mm. latus, summo dense pilosus pilis 0.5 mm. longis. Perennial; culms slender, erect or somewhat geniculate, branching at the lower nodes, glabrous, smooth and shining, the nodes retrorsely bearded; sheaths about as long as the internodes, keeled, at least toward the summit, pilose or papillose-pilose with spreading hairs, the uppermost elongate, glabrous on the back, the margins papillose-ciliate; ligule membranaceous, erose, 1.5 mm. long; blades flat, 10-30 cm. long, 2-3 mm. wide, the uppermost greatly reduced, attenuate, pilose, the margins and underside of the mid-nerve papillose-hispid; inflorescences terminal and axillary, the axillary entirely enclosed in the sheath, of one arcuate raceme 8-12 cm. long, densely pilose at the base, the rachis 1.8 mm. wide, papillose-ciliate, the hairs 2-5 mm. long? spikelets 3 mm. long; first glume obsolete; second glume flat, 5-nerved, acute, scabrous, the margins hispid at the tip; sterile lemma a little shorter than the second glume enclosing a well-developed palea and staminate flower, early splitting down the middle, the margins incurved partly enclosing the fruit, 2-keeled toward the summit, the keels hispid-ciliate, each with a rather stout yellowish seta about 2 mm. long near the tip; fruit 2.4 mm. long, 0.7 mm. wide, the margins of the lemma densely pilose at the tip, the hairs about 0.5 mm. long. Type in the U.S. Nat. Herb., no. 1,911,654, collected in vicinity of Sanariapo, near Rio Sanariapo, tributary of Orinoco river, Territorio Federal Amazonas, alt. 100 m., September 8, 1944, Julian A. Steyermark 58502; isotype in herb. Chi. Nat. Hist. Mus. Thrasya setosa is related to T. paspaloides which differs in having shorter racemes, mostly 4-5 cm. long, the axillary ones By Jason R. Swallen. Bambuseae, except Myriocladus, by McClure F. A.
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