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The crinipelloid genera Crinipellis and Moniliophthora (Agaricales, Marasmiaceae) are characterized by basidiomes that produce long, dextrinoid, hair-like elements on the pileus surface. Historically, most species are believed to be saprotrophic or, rarely, parasitic on plant hosts. The primary morphological diagnostic characters that separate Crinipellis and Moniliophthora are pliant vs. stiff (Crinipellis) stipes and a tendency toward production of reddish pigments (ranging from violet to orange) in the basidiome in Moniliophthora. Additionally, most species of Moniliophthora appear to have a biotrophic habit, while those of Crinipellis are predominantly saprotrophic. Recently, several new neotropical collections prompted a morphological and phylogenetic analysis of this group. Herein, we propose a new species and two new combinations: Moniliophthora mayarumsp. nov., described from Belize, is characterized by its larger pileus and narrower basidiospores relative to other related species; Moniliophthora ticoicomb. nov. (= Crinipellis ticoi) is recollected and redescribed from biotrophic collections from northern Argentina; and M. brasiliensiscomb. nov. (= Crinipellis brasiliensis), a parasite of Heteropterys acutifolia. The addition of these three parasitic species into Moniliophthora support a hypothesis of a primarily biotrophic/parasitic habit within this genus.

Resumen. Se presentan nuevos registros de microlíquenes para el norte de Argentina. Se incluyen comentarios de los siguientes taxones: Coniocarpon cinnabarinum (Arthoniaceae); Schistophoron tenue (Graphidaceae); Reimnitzia santensis (Thelotremataceae); Phyllopeltula steppae (Peltulaceae); Dichosporidium nigrocinctum, Enterographa pallidella y Syncesia effusa (Roccellaceae) y Tylophoron crassiusculum (Caliciales, incertae sedis).

Four new species of lichenized fungi from northern Argentina are described and illustrated: Coenogonium albomarginatum Michlig & L. I. Ferraro, C. brasiliense L. I. Ferraro & Michlig, C. flavovirens L. I. Ferraro & Michlig, and C. verrucosum Michlig & L. I. Ferraro. In addition, C. isidiatum (G. Thor & Vězda) Lücking et al., C. magdalenae Rivas Plata, Lücking & Lizano, C. persistens (Malme) Lücking et al., C. pusillum (Mont.) Lücking et al., and C. weberi (Vězda) Lücking et al. are recorded for the first time from South America. The known distribution of 24 species of this lichen genus is extended. A revision of the genus in Argentina and Paraguay is also presented.

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Se presenta un estudio de los géneros Canoparmelia y Crespoa en el Nordeste de Argentina. Siete especies fueron estudiadas, incluyendo Canoparmelia caroliniana y C. cryptochlorophaea como primeros registros para Argentina y C. austroamericana para la región. Se extiende además el área de distribución geográfica conocida de C. texana y Crespoa crozalsiana. Se incluyen descripciones detalladas, ilustraciones y una clave para diferenciar las especies tratadas.

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