Trichoglossum tropicale de la Fuente, Sanchez-Flores & Raymundo, 2022

de la Fuente, Javier Isaac, Garcia-Jimenez, Jesus, Raymundo, Tania, Gohar, Daniyal, Bahram, Mohammad, Sanchez-Flores, Marcos, Valenzuela, Ricardo & Pinzon, Juan P., 2022, Two new species of Trichoglossum (Geoglossaceae, Ascomycota) from south Mexico, MycoKeys 92, pp. 95-108 : 95

Trichoglossum tropicale de la Fuente, Sanchez-Flores & Raymundo sp. nov.

Figs 4A-F , 5E-H.

Holotype.

Mexico. Quintana Roo: Othón P. Blanco Municipality, Pulticub town, alt. 6 m, 19°04'N, 87°33'W, 04 February 2021, de la Fuente JF-526- ITCV, Isotype ENCB 140350. GenBank: OM727119.

Diagnosis.

Trichoglossum tropicale is characterized by the combination of characteristics: capitate ascomata, straight paraphyses with bulbose tips, and the ascospores of 122-132 × 5-5.5 µm with 10-12 septa.

Etymology.

Named tropicale in reference to the tropical occurrence.

Description.

Ascomata black, 15-30 × 2-4 mm, clavate to capitate, stipitate, erect, solitary to gregarious with compressed ascogenous portion of 2-4 mm long, 1-2 mm thick, glossoid, ellipsoidal, flattened, sometimes curved, black, without visible setae. Stipe 10-20 mm long, up to 1 mm thick, cylindrical, solid, black to dark brown, hirsute.

Setae 98-200 × 5.5-6 µm, septate, smooth, straight, dark brown to black. Paraphyses filamentous, septate, with capitate to bulbous terminal cells of 8-46 × 6-10 µm. Asci 155-180 × 16-18 µm, cylindrical to clavate, rounded at apex, short-pedicellate at base, hyaline, thin walled, octosporic, inamyloid. Ascospores 122-132 × 5-5.5 µm, filiform, mostly 10-12 septate, slightly curved, hyaline when young, brown to olivaceous when mature, narrowed and rounded at both ends, thin walled, smooth.

Distribution.

Known from the Mexican state of Quintana Roo, growing scattered on soil under Birsonyma crassifolia .

Notes.

This new species differs from other Trichoglossum species by the combination of characteristics: ascomata with inconspicuous setae (98-200 × 5.5-6 µm), straight paraphyses with bulbose tips, and the ascospores of 122-132 × 5-5.5 µm with 10-12 septa. Trichoglossum tropicale is phylogenetically close to T. walteri but that species has ascospores of 60-125 × 5-6 μm with 7 septa and paraphyses curved to circinate ( Mains 1954). A similar species is T. hirsutum due to the capitate ascomata, setae size (up to 225 µm long); differs in the thicker setae and larger ascospores (90-150 × 5-7 µm) with 15 septa ( Beug et al. 2014). Trichoglossum velutipes has similar ascospore septation, but it has four-spored asci and bigger ascospores (110-145 × 6-7 µm) with 7-11 septa ( Ekanayaka et al. 2017). Trichoglossum variabile has similar number of septa, but differs in the presence of four-spored asci, smaller setae (69-183 × 7.6-12 µm), and bigger ascospores (80-150 × 6 µm) with 9-14 septa ( Mains 1954; Beug et al. 2014).

Figures

Figure 4. Trichoglossum tropicale (Holotype) A, B ascomata C asci D detail of setae E ascospore F detail of paraphyses. All microstructures are mounted in KOH.

Figure 5. New Trichoglossum from Mexico. Trichoglossum caespitosum A ascomata B setae C ascus D ascospore. Trichoglossum tropicale E ascomata F setae G ascus H ascospore.