Paragaeumannomyces smokiensis Reblova & A.N. Mill., 2020

Reblova, Martina, Nekvindova, Jana, Fournier, Jacques & Miller, Andrew N., 2020, Delimitation, new species and teleomorph-anamorph relationships in Codinaea, Dendrophoma, Paragaeumannomyces and Striatosphaeria (Chaetosphaeriaceae), MycoKeys 74, pp. 17-74 : 17

Paragaeumannomyces smokiensis Reblova & A.N. Mill. sp. nov. Figure 10

Typification.

USA - Tennessee • Sevier Co., Great Smoky Mountains National Park, Greenbrier, alternative side trail to Whaley Cemetery; alt. 549 m; 10 Jul. 2005; on decaying wood; A.N. Miller & A.M. Stchigel leg.; A.N.M. 466 (holotype: ILLS00121398!).

Etymology.

Named after the Great Smoky Mountains National Park from where it was collected.

Description on the natural substrate.

Teleomorph: Ascomata perithecial, non-stromatic, superficial, solitary or in small groups, 270-390 μm diam, 320-400 μm high, subglobose to broadly conical, finely roughened, dark reddish-brown, glabrous except for the black papilla with dark brown, stiff, acute setae, 9.5-13.5 × 2-2.5 μm, densely aggregated around the ostiole. Ostiole periphysate. Ascomatal wall leathery, three-layered; outer layer of textura angularis consisting of globose to subglobose, reddish-brown cells; middle layer composed of brick-like, brown cells; inner layer of flattened, thin-walled, subhyaline cells. Paraphyses abundant, hyaline, longer than the asci, tapering. Asci (134-)140-174(-189) × 11-13(-14) μm (mean ± SD = 158.2 ± 19.4 × 12.3 ± 0.9 μm), cylindrical-fusiform, stipitate, apically narrowly rounded, ascal apex non-amyloid with a distinct apical annulus 2-2.5 μm wide, 1-1.5 μm high. Ascospores (58-)60.5-80.5 × (3-)3.5-4.5(-5) μm (mean ± SD = 69.8 ± 6.3 × 4.0 ± 0.5 μm), filiform to cylindrical, straight or slightly curved, hyaline, 9-11-septate, septa often unevenly distributed, not constricted at the septa, asymmetrical, rounded at the apical end, tapering towards the basal end, with one or two guttules in each cell, 2-3-seriate or 4-seriate and partially overlapping, seldom in a single fascicle. Anamorph: Unknown.

Habitat and distribution.

A saprobe on decaying wood, known only from the USA.

Notes.

The present species is most similar to P. abietinus , the only member of the genus known from Europe. They share dark reddish-brown, glabrous ascomata with short setae surrounding the ostiole. Although the size of ascospores of both species overlap, P. abietinus differs from P. smokiensis by longer [(185-)195-240 × 12-14.5(-15.5) μm] asci and slightly longer and wider ascospores [(62-)65-87 × (3.5-)4-5.5 μm] with usually less septa [(5-)7-9(-11)].

Figures

Figure 10. Paragaeumannomyces smokiensis (ILLS 00121398). A, B ascomata C globose cells of the outer layer of the ascomal wall and an ostiolar seta D, E asci F, G ascal apex with apical annulus H-K ascospores. Scale bars: 250 μm (A, B); 50 μm (C); 20 μm (D, E); 10 μm (F-K).