Poroid fungi (Basidiomycota, Agaricomycetes) are characterized by the presence of the
tubular hymenophore/pores. However, because belongs polyphyletic group, poroids also
harbor species of smooth and toothed hymenial surface. Most of the poroid fungi degrade
dead wood, decomposing this substrate, thus being called lignocellulolytic. But also is found
some species living in the soil or, rarely, parasitizing plants. In order to contribute to the
knowledge about the richness and ecology of this group of fungi in the Brazilian Amazon,
four collections were carried out in a forest area in the west of Santarém between january and
october 2018. In each collection were crossed 30 transects of 250 meters each, where 545
specimens were collected in 91 species, 43 genera, seven families and two orders. Being 16
species of new records for the state and one for South America. Most species (87; 96%) were
considered occasional or rare, with only four species considered frequent, and none abundant.
The variation of abundance, species richness and composition of poroid fungi were
investigated over time in relation to: canopy opening, temperature, air humidity and rainfall.
The richness of poroid fungi was significantly influenced by moisture, while the composition
was influenced by temperature, humidity and rainfall. The percentage of canopy opening did
not influence any biotic variable. The abundance, richness and composition are different in
sample periods, being greater in the rainy period. The number of occurrence and preference of
poroid fungi species is higher in dead than alive logs, as well as the greater relation between
the D1 and D2 decomposition stages, corroborating some studies in Brazil. The distribution of
the assembly is totally random with no effect of the abiotic or geographical variables on the
co-occurrence of the species.
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