Agaricaceae Fr . ( Agaricales , Basidiomycota ) from areas of Atlantic Forest in Pernambuco , Brazil 1

(Agaricaceae Fr. (Agaricales, Basidiomycota) from areas of Atlantic forest in Pernambuco State, Brazil). The survey of Agaricaceae in areas of the Atlantic Forest in the metropolitan region of Recife, state of Pernambuco, Brazil, revealed the presence of nine species: Agaricus aff. parasilvaticus Heinem., A. purpurellus (F.H. Møller) F.H. Møller, A. rufoaurantiacus Heinem., Leucoagaricus sulphurellus (Pegler) B.P. Akers, Leucocoprinus cretaceus (Bull.: Fr.) Locq., L. fragilissimus (Ravenel) Pat., Lepiota elaiophylla Vellinga & Huijser, L. erythrosticta (Berk. & Broome) Sacc. and Micropsalliota brunneosperma (Singer) Pegler. A key for identification of these species, descriptions, drawings and remarks are provided. Micropsalliota brunneosperma is reported for the first time for Brazil.


Introduction
Agaricaceae Fr. sensu Singer (1986) includes 25 genera, most of them distributed over several continents and organized in four tribes: Leucocoprinae Singer, Agariceae Pat., Lepiotae Fayod and Cystodermatae Singer.According to Kirk et al. (2001), this family comprises 51 genera and 918 species, including several genera with gasteroid and secotioid basidiomata.Although some authors have considered species with light and those with dark spores to lie in two distinct families (Smith 1973;Bon 1993), molecular studies confirm the monophyly of this group, except for Cystodermateae (Johnson & Vilgalys 1998;Vellinga 2004a).
The specimens studied were deposited at the Herbarium URM ("Departamento de Micologia, Universidade Federal de Pernambuco") and Herbarium HCB ("Departamento de Biologia, Universidade de Santa Cruz do Sul").Remarks: The small basidioma with small fibrillose squamules on the pileal surface and ellipsoid basidiospores place this species in section Sanguinolenti Jul.Schäff.& F.H. Møller (Heinemann 1977).A related species is Agaricus earlei Murrill, from Cuba, with indistinctly apiculate and ellipsoid basidiospores 5×3 µm (Murrill 1918).Freeman (1979) revised the type of A. earlei and reported basidiospores 4.5-5.5×3-3.8µm.On the other hand, Pegler (1987) reported A. earlei as having larger basidiospores 6-7.5×3.4-4.2 µm and did not observe any trace of yellow colour in the exsiccate nor in the original illustration and placed this species near to A. parasilvaticus.This discrepancy on the size of basidiospores of A. earlei makes an exact comparison between this species and A. parasilvaticus imprecise or impossible without reviewing the types.In the collection studied there was no colour change to yellow in the fresh basidioma, and the microscopic characters agree with the description of A. parasilvaticus given by Pegler (1983).
Remarks: This tropical species, macroscopically characterized by floccose white squamules on the pileus and inflated fusiform bulbous stipe, is frequently reported as growing on greenhouse and compost heaps from Europe (Josserand 1955;Candusso & Lanzoni 1990 as L. cretatus).
Remarks: The material differs from Lepiota xanthophylla P.D. Orton mainly by the absence of a layer of clavate elements in the pileipellis (Vellinga & Huijser 1997).The Brazilian collection agrees with the description of L. xanthophylla sensu Pegler (1977), particularly in spore size.Vellinga & Huijser (1997) suggested that Pegler's East African material may be L. elaiophylla Vellinga & Huijser, mainly by the shape of the cheilocystidia and size and shape of the pileipellis hyphae.
Other species with yellowish lamellae and clamps on hyphae occur in the Neotropics: L. parvispora Dennis from Venezuela (Dennis 1961), L. flavidocana Pegler from the Lesser Antilles (Pegler 1983) and L. xanthophylloides Singer from Pará State, North Brazil (Singer 1973 as L. xanthophylla).However, all of them are reported to bear spores predominantly or entirely lesser than 6 µm long.In L. ochraceolamellata Dennis, clamp-connections are absent (Dennis 1961).Other species cited by Vellinga & Huijser (1997) are reported by them as poorly documented, mostly regarding to the presence or absence of clampconnections and structure of the pileipellis.