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NOVELTIES IN TRICHOMANES L. FROM COLOMBIA
ROJAS-ALVARADO,ALEXANDER FRANCISCO;
Caldasia , 2009,
Abstract: i describe tricomanes murilloanum a. rojas a new species from colombia. the new species is characterized by monomorphic fronds with only the apical pinnae pairs fertile. additionally, trichomanes egleri p.g. windisch is reported as a new record for the country.
Four New Species and Additional Distributions of Elaphoglossum Section Elaphoglossum (Dryopteridaceae) from the Neotropics  [PDF]
Alexander Francisco Rojas-Alvarado
American Journal of Plant Sciences (AJPS) , 2017, DOI: 10.4236/ajps.2017.86082
Abstract: Four new species of Elaphoglossum sect. Elaphoglossum are described: E. Amparoanum A. Rojas, E. Chocoense A. Rojas, E. Fayorum A. Rojas and E. Luciae A. Rojas. The first species is related to E. Variolatum Mickel, but differs from it by having rhizome scales bicolorous and long ciliate margin. The second species is different to E. moranii Mickel by having narrower rhizome, shorter stipe, elliptic blade, attenuate blade base, shorter fertile fronds with blackish costa and present at lower altitudinal distribution. After
Three New Species of Ferns (Pteridophyta) from Mesoamerica  [PDF]
Alexander Francisco Rojas-Alvarado
American Journal of Plant Sciences (AJPS) , 2017, DOI: 10.4236/ajps.2017.86089
Abstract: In this research three new species of ferns of the Polypodiales Order are described: Ctenitis leonii A. Rojas, Elaphoglossum karinae A. Rojas and Pecluma celaquensis A. Rojas. Ctenitis leonii is characterized by its apical stipe scales marginally erose to ciliate, blade surfaces with two types of hairs present in both surfaces, ones 0.7 - 1.5 mm long and not glandular, the others 0.3 - 0.5 mm long and glandular and indusia are absent. Elaphoglossum karinae differs from Elaphoglossum dissitifrons Mickel by shorter rhizome, longer and relatively narrower rhizome scales, they lanceolate to linear-lanceolate and blackish costal scales. Pecluma celaquensis is similar to Polypodium martensii Mett., but differs by its thinner rhizome, smaller rhizome scales and these with a crown of brown cilia at the attaching point, relatively shorter stipe with longer hairs and these commonly no glandular, scaly rachis and it with longer and denser hairs, inframedial sori and glabrous sporangia.
Five New Species of Diplazium Sw. (Athyriaceae) from Nicaragua, Costa Rica and Colombia  [PDF]
Alexander Francisco Rojas-Alvarado
American Journal of Plant Sciences (AJPS) , 2018, DOI: 10.4236/ajps.2018.95071
Abstract: Five new species are described in the genus Diplazium Sw. from Nicaragua, Costa Rica and Colombia, as results of studies in the Neotropical ferns. The new species are Diplazium chirripoense A. Rojas, Diplazium cornutum A. Rojas, Diplazium crassirhizoma A. Rojas, Diplazium lustrosum A. Rojas and Diplazium rodriguezii A. Rojas. The first species is related to D. skutchii Lellinger, but differs from it by having glabrous stipe, glabrous blade abaxially, hyaline and entire indusia, and distributed and higher elevations. The second species is different to D. diplazioides (Klotzsch et H. Karst.) Alston by having densely scaly stipe, rachis and costa, relative bigger pinnae and entire to erose indusia. After that, the third species differs from D. werckleanum Christ by thicker rhizome, bigger rhizome scales and blade with 1 - 2 buds at apex. Consecutively, the fourth species differs from D. lindbergii (Mett.) H. Christ by thinner rhizome, shorter fronds, longer stipe, smaller blade, less pinnae pairs, shiny laminar tissue and veins 3 - 5 pairs per segment. Finally, the fifth species is related to D. tungurahuae (Sodiro) C. Chr., but with abaxially glabrous rachis and costae, pinnules 4 - 5 times longer than wide and entire,
Three New Species and New Records of Dennstaedtia Bernh. from Mesoamerica  [PDF]
Alexander Francisco Rojas-Alvarado, Federico Villalobos-Brenes
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1105020
Abstract:
Navarrete & Ollgaard [1] indicated the presence of a “C” group within Dennstaedtia Bernh. that contains D. obtusifolia (Willd.) T. Moore, which is the type material of the genus Patania C. Presl and indicated that it could require taxonomic recognition. They also discussed the situation generated by other authors including D. cornuta (Kaulf.) Mett. and D. obtusifolia as synonyms for D. dissecta (Sw.) T. Moore and then separated them as valid species; however, they insist on mentioning variables within the mentioned species and indicated that other species could be included. As a result of this group’s review from Costa Rica, it was found that there are three easily distinguishable new species: D. axillaris A. Rojas, D. rectangularis A. Rojas and D. riparia A. Rojas. Also, D. cornuta is registered from Mexico and Guatemala, and D. sprucei T. Moore is registered from Costa Rica.
New species, new combinations and new distributions in neotropical species of Elaphoglossum (Lomariopsidaceae)
Rojas-Alvarado,Alexander Fco.;
Revista de Biología Tropical , 2002,
Abstract: more new species, new combinations and new distributions are made in the large and difficult genus elaphoglossum in neotropic. ten new species are describes, this are: elaphoglossum adrianae a. rojas, e. betancuri a. rojas, e. caridadae a. rojas, e. glabromarginatum a. rojas, e. kessleri a. rojas, e. macdougalii a. rojas, e. paramicola a. rojas, e. paxense a. rojas, e. pseudoherminieri a. rojas and e. solomonii a. rojas. three species are combined, this are: elaphoglossum beitelii (mickel) a. rojas, e. curvans (kunze) a. rojas and e. eutecnum (mickel) a. rojas. finally, 86 species are reported from other countries and some species names are synonymized.
Notes on Elaphoglossum (Lomariopsidaceae) section Polytrichia subsection Hybrida in Mexico and Central America
Rojas-Alvarado,Alexander Fco.;
Revista de Biología Tropical , 2003,
Abstract: in elaphoglossum sect. polytrichia subsect. hybrida six new species are described: e. angustiob-longum a. rojas, e. baquianorum a. rojas, e. cotoi a. rojas, e. jinoteganum a. rojas, e. neeanum a. rojas and e. silencioanum a. rojas. new combination is made for elaphoglossum mexicanum (e. fourn.) a. rojas. two species are reported: e. barbatum (h. karst.) hieron. and e. scolopendrifolium (raddi) j. sm. two species are redefined: e. erinaceum (fée) t. moore and e. tambillense (hook.) t. moore. e. pallidum (baker ex jenman) c. chr. is eliminated for mexico and central america. of the new species only e. neeanum is present outside of the region. a key is given to those species in mexico and central america.
New taxa, new records and redefined concepts in the Elaphoglossum sect. Elaphoglossum subsec. Pachyglossa (Lomariopsidaceae) from Mexico and Central America
Rojas-Alvarado,Alexander Fco.;
Revista de Biología Tropical , 2003,
Abstract: twelve new species are described in the taxonomically difficult elaphoglossum (sect. elaphoglossum): elaphoglossum angustifrons a. rojas, e. delgadilloanum a. rojas, e. ellipticifolium a. rojas, e. incognitum a. rojas, e. mesoamericanum a. rojas, e. nicaraguense a. rojas, e. polypodium a. rojas, e. tejeroanum a. rojas, e. reptans a. rojas, e. terrestre a. rojas, e. variabile a. rojas and e. zavale a. rojas. also, e. latifolium (sw.) j. sm., e. sartorii (liebm.) mickel and e. viride (e. fourn.) c. chr. are amended, e. andicola (fée) t. moore and e. sporadolepis (kunze ex kuhn) t. moore are reported.
Nuevas combinaciones en Alansmia M. Kessler, Moguel, Sundue et Labiak (polypodiaceae) para Costa Rica, Panamá y Colombia New combinations in Alansmia M. Kessler, Moguel, Sundue et Labiak (polypodiaceae) from Costa Rica, Panama, and Colombia
Alexander F. Rojas-Alvarado
Actualidades Biológicas , 2012,
Abstract: Cinco especies de Terpsichorez A.R. Sm. son combinadas aquí en el reciente género Alansmia M. Kessler, Moguel, Sundue et Labiak: A. acrosora (A. Rojas) A. Rojas, A. cocosensis (A. Rojas) A. Rojas, A. esquiveliana (A. Rojas) A. Rojas, A. fabispora (Copel.) A. Rojas y A. lobulata (A. Rojas) A. Rojas. En cada una de las ellas se indican las principales diferencias con taxones relacionados. Adicionalmente se presenta una clave dicotómica para el reconocimiento de las especies conocidas en Costa Rica, Panamá y Colombia. Five species of Terpsichorez A.R. Sm. are combined here under the recently described genus Alansmia M. Kessler, Moguel, Sundue et Labiak: A. acrosora (A. Rojas) A. Rojas, A. cocosensis (A. Rojas) A. Rojas, A. esquiveliana (A. Rojas) A. Rojas, A. fabispora (Copel.) A. Rojas y A. lobulata (A. Rojas) A. Rojas. In each species, the main differences with related taxa are mentioned. Additionally a dichotomous key is presented for recognize the known species in Costa Rica, Panama, and Colombia.
NOVEDADES EN DIPLAZIUM (WOODSIACEAE) CON FRONDAS PINNADO-LOBULADAS PARA EL NEOTRóPICO NOVELTIES IN DIPLAZIUM (WOODSIACEAE) WITH PINNATE-LOBULATE FRONDS FROM THE NEOTROPICS
Alexander F. Rojas-Alvarado
Actualidades Biológicas , 2012,
Abstract: Dos especies nuevas de Diplazium con frondas pinnado-lobuladas son descritas aquí: D. pseudocarnosum y D. salazarianum. La primera especie de ellas puede distinguirse de Diplazium carnosum por presentar escamas del rizoma más cortas, frondas más cortas, relativamente menos pares de pinnas y estas pinnas lanceolado-oblongas, 3-4 veces más largas que anchas, comúnmente con una yema axilar en el último par de pinnas e indusio con el margen eroso. La segunda especie difiere de Diplazium urticifolium por presentar pinnas con margen lobulado e inciso 1/4-2/5 entre el margen y la costa y con 5-10 yemas axilares por fronda. Adicionalmente, se describe D. urticifolium var. mesoamericanum la cual se caracteriza por tener un ápice pinnatífido sin yema subterminal. Finalmente, se combina Diplazium costale var. robustum a Diplazium robustum y se amplía su distribución, y finalmente se amplía la distribución de Diplazium moccennianum. Two new species of Diplazium with pinnately-lobed fronds are described here: D. pseudocarnosum and D. salazarianum. The first species can be distinguished from Diplazium carnosum by shorter rhizome scales, shorter fronds, relatively fewer pinnae pairs and these pinnae lanceolate-oblong and 3-4 times longer than wide, usually with an axillary bud in the last couple of pinnae and the indusium with erose margin. The second species differs from Diplazium urticifolium by pinnae lobed and incised margin with 1/4-2/5 between the margin and the costa and axillary buds 5-10 per frond. Additionally, it describes D. urticifolium var. mesoamericanum which features a pinnatifid apex without subterminal buds. Finally, Diplazium costale var. robustum is transfereded to D. robustum and it distribution is expanded, and the distribution of Diplazium moccennianum is extended.
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