Ravenelia hernandezii Ebinghaus & Begerow, sp. nov. on Senegalia tenuifolia (L.) Britton and Rose (Mimosoideae, Leguminosae)

Ebinghaus, M. & Begerow, D., 2018, Raveneliapiepenbringiae and Raveneliahernandezii, two new rust species on Senegalia (Fabaceae, Mimosoideae) from Panama and Costa Rica, MycoKeys 41, pp. 51-63 : 53

Ravenelia hernandezii Ebinghaus & Begerow, sp. nov. on Senegalia tenuifolia (L.) Britton and Rose (Mimosoideae, Leguminosae) Fig. 3

Type.

Costa Rica, Guanacaste, Area de Conservación Guanacaste, Sendero Bosque húmedo (10°50.702'N, 85°36.450'W) on Senegalia tenuifolia (L.) Britton and Rose, coll. J.R. Hernandez, 1. December 2003. Holotype: BPI 872308 (BPI).

Etymology.

Named after J.R. Hernández who collected the type specimen.

Spermogonia and aecia not seen. Uredinia hypophyllous, minute, single or in small and often loose groups, ochraceous to light brown, 0.1-0.3 mm in diameter, aparaphysate, subepidermal, erumpent and surrounded by torn epidermis; urediniospores obovoidal, ellipsoidal, often reniform or slightly curved, ochraceous brown, often with an attached fragment of the pedicel, (17)18-21(24) × (8)9-10(12) mm; spore wall thin, laterally (0.5)1-1.5 mm thick, apically and basally slightly thickened, distinctly echinulate; aculei approximately 1.0-1.5 mm high, germ pores 5-6, in equatorial position. Telia replacing uredinia, chestnut- to dark brown. Teliospores (59)67-75(96) mm, roundish or broadly ellipsoidal to oblong in planar view, hemispherical in lateral view, 5-6 probasidial cells across, single-layered, central cells often arranged in two rows of 3 or 4 cells, each cell (19)22-25(39) × (11)17-22(28) mm, cell wall thickened at the apex, (2.5)3.0-4.5(6.0) mm thick, often with a thin and hyaline outer layer, probasidial cells each with 3-5 rod-shaped straight spines (1)3-4(6) mm long; cysts on the abaxial side of the teliospores, uniseriate and in same position and number as the peripheral probasidial cells, globose, hyaline, swelling in water, slight swelling in lactophenol.