Lamelloporus americanus ( Fungi : Polyporales ) : A new record for Peru

Lamelloporus americanus, collected in the vicinity of the community of Vitobamba in the Department of Cusco in southeastern Peru, is reported as new to the country, besides expanding its geographical distribution to the Southern Hemisphere. Description and comments about the apparent distribution pattern of the species are presented. 1 Universidad Nacional Mayor de San Marcos, Museo de Historia Natural, Departamento de Gimnospermas y Monocotiledóneas, Av. Arenales 1256 Jesús María, Lima, Peru. 2 Botanical Research Institute of Texas (BRIT), 1700 University Drive, Fort Worth, Texas, USA. 3 Universidade Federal de Santa Catarina, Centro de Ciências Biológicas, Departamento de Botânica, Campus Universitário, Trindade, CEP: 88040900, Florianópolis, SC, Brazil. * Corresponding author. E-mail: csalvador05@gmail.com Carlos A. Salvador-Montoya 1,3*, Betty Millán 1, John Janovec 2 and Elisandro R. Drechsler-Santos 3 Lamelloporus americanus (Fungi: Polyporales): A new record


Lamelloporus americanus (Fungi: Polyporales): A new record for Peru
Lamelloporus Ryvarden is a neotropical and monospecific genus represented by L. americanus Ryvarden (Ryvarden 1987).This species belongs to the family Meruliaceae P. Karst.(Polyporales Gäum.) and is characterized by a concentrically lamellate hymenophore, unlike other Polyporales species.The cartilaginous context with concentric dark and dense zones is another good characteristic to identify this species in the field.Initially, the species was described with distribution to Southern Mexico and Venezuela (Ryvarden 1987).In Mexico, it was collected in Veracruz (type and isotype in O and XAL Herbaria, respectively, Ryvarden 1987) and recently in Hidalgo (Romero-Bautista et al. 2010).In Central America the species was recorded in Panama (Guzmán andPiepenbring 2011) andCosta Rica (Mata et al. 2007).In South America was recorded in Venezuela (Ryvarden 1987) and Ecuador (Laessøe and Petersen 2008).
The Peruvian specimen of L. americanus [C.A. Salvador-Montoya 111, 11.III.2010 (USM 239483, FLOR), on decaying wood] was collected in the vicinity of the community of Vitobamba (10°40'5.58"W, 76°42'6.94"N, from 1000 to 1500 m a.s.l.), in the District of Camanti, Department of Cusco.This locality is composed of typical pre-montane forest with mostly evergreen, woody vegetation with up to 40 m high trees and large palms.Microscopical examination was achieved from freehand sections of specimens and mounted in Melzer's reagent to determine the presence (dextrinoid or amyloid) or absence of reaction.All microscopic measurements (n = 40) and basidiospores drawings were made in KOH5% with 1% aqueous phloxine solution.The arithmetic mean of the measurements of the tested materials is given in the description.The isotype [Mexico, Veracruz: Mpio.de Jalacingo, Barranca, Cruz Blanca (bosque de Ulmus, 1500 m a.s.l.), F. Ventura 7428 21.XI.1972,XAL] was analyzed as additional comparative material.Nomenclature follows Index Fungorum (http://www.Indexfungorum.org/Names/Names.asp).Duplicate specimens were deposited in the San Marcos Herbarium (USM) of the Universidad Nacional Mayor de San Marcos in Lima, Peru and in the mycological collection of the FLOR Herbarium of the Universidade Federal de Santa Catarina in Florianópolis, Santa Catarina state, Brazil.Authorization for collections (RD 0202-2010-AG-DGFFS-DGEFFS) and export permits (003923-AG-DGFSS) were granted by the Directorio General de Flora y Fauna Silvestre (DGFFS) of Peru.
Basidioma pileate, spathulate with a lateral tapering base, up to 2.2 cm long, 1.7 cm wide and 0.35 cm thick, soft when fresh and hard when dry; upper surface white to pale brown, glabrous, smooth to rough at base, with indistinct concentric zones at the edge; margin thin, straight, wavy in dried specimens.Hymenial surface concentrically lamellate, white, thicker towards base, up to 0.2 cm deep.Context soft when fresh, cartilaginous when dry, white when fresh to dark brown with numerous concentric dark zones when dry, xanthocroic reaction negative.
This species is easily recognized by its white basidiome with concentrically lamellate pore surface and cartilaginous context with concentric dark and dense zones (Ryvarden 1987).The Peruvian material presents basidiospores slightly smaller than those described by Ryvarden (1987,(3)(4) x 2-2.5 µm), as observed by us in the isotype material.
This saprophytic species has been collected most frequently in Central America and Mexico (Ryvarden 1987, Mata et al. 2007