Rambellia nodosa R.F.Castañeda, D.W.Li & P.M.Kirk, 2024

Rambellia nodosa R.F.Castañeda, D.W.Li & P.M.Kirk , sp. nov.

Index Fungorum: IF902079.

Diagnosis: Rambellia nodosa differ from Acrodictyopsis lauri P.M. Kirk (1983: 262) by the tretic conidigenesis, dimensions, and dictyoseptate conidia with helicosporous affinities during development.

Etymology:—In reference to the bulbil-subclathroid, irregular catenate conidia.

Holotype (designed here):— COSTA RICA, Parque Nacional La Amistad , on indeterminate dead leaves, 11 February 2005, USJ 110000 .

Illustration:—Fig. 39 p. 145 ( Rambelli & Ciccarone 2008).

Description:—Colonies hairy-granulose, brown. Conidiophores solitary, macronematous, unbranched or sometimes branched at the apex, straight or slightly flexuous, smooth, brown, 100–200 × 9 µm. Conidiogenous cells polytretic, integrated, terminal and intercalary, sympodial extended, cicatrized. Conidia acropleurogenous, bulbiloid-subclathroid or rudimentary sclerotium-like, complex, composed by compact, irregular, euseptate, body, multicellular, somewhat globose, conglomerated, with cells globose, smooth, ≤ 13 µm diam., moniliform, smooth, pale brown or brown.

Notes:—The genus Rambellia is distinguished by the specimen that the production of bulbil-subclathroid to rudimentary sclerotium-like, complex conidia seceding schizolytically from tretic conidiogenous cells, and superficially resembles the monotypic genus Acrodictyopsis lauri P.M.Kirk that has holoblastic, complex, irregular, somewhat coiled, multicellular conglomerated conidia ( Kirk 1983).

Originally published as “ Beltrania maxima ” Rambelli [in Rambelli & Ciccarone, Quad. Bot. ambient. appl. 19: 127 (2008), nom. inval., Art. 40.1, see Arts 40.2, 40.3: the missing information on the location of the holotype] [IF 581592], is replaced by the genus described below.