| Table of contents Act. Bot. Mex n.98 Pátzcuaro Jan. 2012 Semblanza. Paul Arnold Fryxell (1927-2011)
| | Morphogenesis of the sexual phase of seven epiphitic taxa of Polypodium (Polypodiaceae) from Mexico Vázquez-Pérez, Nancy; Mendoza-Ruiz, Aniceto; Pérez-García, Blanca
| | Floristics and diversity of the Lerma river wetlands in the State of Mexico Zepeda-Gómez, Carmen; Lot-Helgueras, Antonio; Nemiga, Xanat Antonio; Madrigal-Uribe, Delfino
| | Diversity and morphology of the species of Pseudo-nitzschia (Bacillariophyta) of the national park Sistema Arrecifal Veracruzano, SW Gulf of Mexico Parsons, Michael L.; Okolodkov, Yuri B.; Aké-Castillo, José A.
| | Useful and relevant wild plants identified in the Mixteca Poblana, Mexico Martínez-Pérez, Aniceto; López, Pedro Antonio; Gil-Muñoz, Abel; Cuevas-Sánchez, Jesús Axayácatl
| | Contribution to the cytogenetics of Tamarindus indica (Leguminosae: Caesalpinioideae) Tapia-Pastrana, Fernando; Mercado-Ruaro, Pedro; Gómez-Acevedo, Sandra
| | Phymatosorus grossus (Polypodiaceae) in Mexico and comments on other non-native pteridobionts Tejero-Díez, J. Daniel; Torres-Díaz, Alin N.
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