Indice

Characterization of the decline of oak forests in "Sierra de Lobos" Guanajuato, Mexico
Vázquez Silva, J. C. Tamarit Urias, J. Quintanar OIguín, L. Vare1a Fragoso

Anatomy and histochemistry ofthe bark offive species of Moraceae
A. Quintanar, J. L. Zárate Castrejón, C. López, I. H. Salgado

A new registrationfor Mexico of Pleopeltis x Sordidula (Maxon ex Weath in Weath) Mickel et Beitel, a hybrid among Pleopeltis Astrolepis (Liebm.) Fourn. and Pleopeltis fallax (Schldl. et Cham.) Mickel et Beitel. (Polypodiaceae-Pteridophyta) in Tlaxcala, Mexico
M. L. Arreguín, J. Huerta, B. A. Gutiérrez

Illustrated generic key for the identification of pteridophytes of the Balsas river Basin, Mexico
G. Gómez, M. L. Arreguín

The family Bombacaceae in the Balsas river Basin, Mexico
M. Pagaza, R. Fernández

The polypores from Mexico VII. First record of Perenniporia phloiophila Gilbertson & Blackwell and Trechispora regularis (Murill) Liberta
R. Valenzuela, T. Raymundo, R. Fernández

Checklist of the north of Chiapas: Catazaja and limits with Palenque
C. Gutiérrez

Additional notes about Phoradendron teretifolium Kuijt (Viscaceae) in the state of Veracruz, Mexico
H. Oliva, F. Ramón

The type collection ofthe W. P. Fraser herbarium (SASK) of the University of Saskatchewan
J. H. Cota, R. W. OIson and J. Haraldson