Adiantum humile Kunze

Matos, Fernando B., Bohn, Amabily & Labiak, Paulo H., 2020, The ferns and lycophytes of Reserva Natural Guaricica, Antonina, Paraná, Brazil, Check List 16 (1), pp. 183-206 : 196

Adiantum humile Kunze

Figure 5C

Examined material. BRAZIL • 2 specimens; Estrada Sede-Gervásio ; 25°17′33″S, 048°42′15″W; alt. 30 m; 30 Apr. 2005; F.B. Matos & M.O. Silva 547 leg.; MBM333067, UPCB287 • 2 specimens; Trilha da Guar- icica; 25°19′13″S, 048°42′04″W; alt. 20 m; 8 Oct. 2005; F.B. Matos & P.B. Schwartsburd 877 leg.; MBM333066, UPCB286 • 1 specimen; Trilha da Pantera ; 25°18′02″S, 048°38′31″W; alt. 215 m; 29 May 2019; F.B. Matos et al. 2617 leg.; UPCB44503 .

Identification. Characterized by short-creeping stems, 2-pinnate leaves with only 2–4 pairs of lateral pinnae, petioles and rachises with only one kind of scale (fili- form subulate ), pinnules abaxially glaucous and with long, septate, brown hairs, margins of sterile pinnules finely serrate, and glabrous indusia. Sori marginal, inter- rupted, the sporangia borne on the inner surface of the false indusium (not below it). Adiantum latifolium Lam. differs by long-creeping stems with leaves distant (vs approximate) from each other and pinnae abaxially glabrous. Adiantum terminatum Kunze ex Miq. differs by indusia bearing hairs.

Distribution and habitat. Neotropical. Terrestrial in forests.