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Three new neotropical species of Elaphoglossum (Elaphoglossaceae) with subulate scales. Brittonia 56: 200–204. 2004.—Three new neotropical species of subulate-scaled Elaphoglossum are described and illustrated: E. minutissimum, E. rosettum, E. semisubulatum. The first occurs in Costa Rica, the second and third in Bolivia.
Lomariopsis ×farrarii: a new hybrid fern between L. japurensis and L. vestita (Lomariopsidaceae) from Costa Rica. Brittonia 56: 205–209. 2004.—A new hybrid, Lomariopsis ×farrarii, is illustrated and described from the La Selva Biological Station, Costa Rica. It is intermediate between its parents, L. japurensis and L. vestita in length and color of the rhizome scales, shape and number of the pinnae, and size and division of the juvenile leaves in a heteroblastic series.
Moran, R. C. (The New York Botanical Garden, Bronx, NY 10458-5126, U.S.A.; rmoran@nybg.org) & J. E. Watkins Jr. (Department of Botany, University of Florida, 220 Bartram Hall, P.O. Box 118526, Gainesville, FL 32611-8526, U.S.A.; ewatkins@ufl.edu). Lomariopsis ×farrarii: a new hybrid fern between L. japurensis and L. vestita (Lomariopsidaceae) from Costa Rica. Brittonia 56: 205–209. 2004.—Un híbrido nuevo, Lomariopsis ×farrarii, se describe y se ilustra de la Estación Biológica La Selva, Costa Rica. Tiene características intermedias de sus padres, L. japurensis y L. vestita, en la longitud y el color de las escamas del rizoma, la forma y el número de las pinnas, y el tamaño y la división de las hojas jóvenes en una serie heteroblástica.
Cyathea bettinae, a new tree fern from Bolivia. Brittonia 56: 210–212. 2004.–A new species of Cyatheaceae is described and illustrated: Cyathea bettinae. It is a small tree fern from the mountain forest of northwestern Bolivia.
A revision of Gibsoniothamnus L. O. Williams (Schlegeliaceae). Brittonia 56: 213–237. 2004.—Gibsoniothamnus L. O. Williams is a genus of 11 species native to Mexico, Central America, and northern Colombia. The species are shrubs or small trees with opposite, entire leaves, tubular corollas, four stamens, 2-locular ovary, and fleshy, indehiscent fruits. Calyces are unlobed, or they may have lateral, triangular or winglike lobes. Most species are epiphytes and appear to be bird pollinated and bird dispersed.
Nevada: A new genus for Smelowskia holmgrenii (Brassicaceae). Brittonia 56: 238–244. 2004.—Nevada holmgrenii was originally described by Rollins as a Smelowskia, but based on phenetic similarities it appears to be more closely related to the arctic/alpine genera Braya and Eutrema. It is, however, sufficiently distinct from these genera to be placed in a monotypic genus, Nevada.
Lectotypifications and new combinations in North American Brassicaceae. Brittonia 56: 245–248. 2004.—Lectotypes are selected for names of five taxa in five genera of Brassicaceae: Boechera, Cardamine, Caulanthus, Cusickiella, Descurainia. Fourteen new combinations are made in six genera: Boechera, Descurainia, Erysimum, Parrya, Physaria, and Thelypodium.
Lectotypification of a name and a new combination in North American Mentzelia (Loasaceae). Brittonia 56: 249– 251. 2004.—A lectotype for the name Mentzelia multiflora var. integra is selected and a new combination in Mentzelia (Loasaceae) is made. A key to the varieties of Mentzelia marginata is included.
Lectotypifications of ten names of North American taxa in Clusiaceae, Elatinaceae, Ericaceae, Primulaceae, and Violaceae. Brittonia 56: 252–254. 2004.—Lectotypes are selected for 10 names in Hypericum (Clusiaceae), Elatine (Elatinaceae), Arctostaphylos and Vaccinium (Ericaceae), Androsace (Primulaceae), and Viola (Violaceae).
Two new species of Pourouma (Cecropiaceae) from South America. Brittonia 56: 255–259. 2004.—Two new species of Pourouma are described, illustrated, and keyed out; P. cordata from Peru and Brazil, and P. montana from Peru.
Three new taxa in Cyrtopodium (Orchidaceae) from central and southeastern Brazil. Brittonia 56: 260–274. 2004.—Cyrtopodium brunneum, C. lamellaticallosum and C. poecilum var. roseum, from the cerrado and campo rupestre vegetation of central and southeastern Brazil are described and illustrated. Although the description of Cyrtopodium gonzalezii indicated that it is a distinct species, the holotype is referrable to C. brandonianum. The undescribed plants are now described here as C. brunneum. Cyrtopodium gonzalezii is placed in the synonym of C. brandonianum.
Pit membrane remnants in perforation plates and other vessel details of Cornales. Brittonia 56: 275–283. 2004.—Perforation plates and other vessel details as studied with scanning electron microscopy (SEM) have been reported for four species of Cornaceae (s.l.): similar features are shown by the four, suggesting that a more extensive sampling of the family might reveal similar phenomena. Perforation plates contain pit membrane remnants in the form of threads or, less commonly, laminar portions perforated by pores. When least well-represented, the pit membrane remnants are restricted to lateral ends of perforations and to the perforations transitional to lateral wall pitting. Perforations are all clearly bordered. Helical thickenings that do not form a continuous gyre are reported for the vessel walls of Aucuba. The presence of pit membrane remnants in vessel elements of Cornaceae correlates with the mesic habitats occupied by species in this family. The presence and type of pit membrane remnants reported by us in the three genera is very similar, although pit membrane remnants are doubtless a symplesiomorphy and thus not an indicator of relationships. The presence of pit membrane remnants in the three genera, however, does attest to the primitiveness of wood and other features of Cornaceae s.l.
A new species of Solanum subgen. Leptostemonum (Solanaceae) of Argentina. Brittonia 56: 284–287. 2004.—Solanum homalospermum (Solanum subgen. Leptostemonum) is described and illustrated from central Argentina. Solanum homalospermum is characterized by having heteromorphic gynoecia, strongly flattened seeds, unequal anthers, and gemmiferous roots.
Cissus xerophila (Vitaceae), a new species from the xerophytic vegetation of northeastern Minas Gerais, Brazil. Brittonia 56: 288–290. 2004.—A new species of Vitaceae is described and illustrated: Cissus xerophila, a simple-leaved species similar to C. verticillata (L.) Nicolson & C. E. Jarvis and related species. A key to the group in South America is presented.
Brittonia 56: 291–293. 2004.— Except for a robust habit, two specimens of Aloina collected in northern Argentina are morphologically similar and are tentatively attributed to A. rigida (Hedw.) Limpr. This represents an addition to the moss flora of Argentina. In addition, two specimens of Aloinella represent significant findings: one shows features that agree with those given in the protologue for A. galeata (Müll. Hal.) Broth. and is treated here as A. galeata var. galeata to show the relationship to A. galeta var. andina (Delgad.) Delgadillo & Schiavone stat. nov.; the other belongs in A. cucullifera (Mitt.) Steere, a new record for Argentina. A key to the known species of Aloinella with updated ranges is included.
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