Trichoglossum caespitosum de la Fuente, J. Garcia & 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 caespitosum de la Fuente, J. Garcia & Raymundo sp. nov.

Figs 3A-E , 5A-D

Holotype.

Mexico. Quintana Roo: Othón P. Blanco Municipality, Chetumal, alt. 8 m, 18°31'N, 88°18'W, 01 December 2015, de la Fuente JF-208- ITCV; Isotype UADY 04867. GenBank: OM727118.

Diagnosis.

Trichoglossum caespitosum is characterized by the unique combination of characters: Caespitose habit, paraphyses with rugose and coiled tips, and the ascospores of 119-127 × 5-7 µm with 9-11 septa.

Etymology.

Named caespitosum in reference to the caespitose habit.

Description.

Ascomata black, 18-30 × 4-10 mm, clavate to spathulate, stipitate, erect, caespitose, with compressed ascogenous portion of 3-7 mm long, 0.5-1 mm thick, glossoid, ellipsoidal, flattened, sometimes curved, black, hirsute with brownish to black setae projecting from the hymenium; stipe 1-33 mm long, up to 6 mm thick, cylindrical, solid, black to dark brown, hirsute.

Setae 250-300 × 5-9 µm, septate, smooth, straight, dark brown to black. Paraphyses filamentous, septate, with rugose, with wide, coiled to clavate terminal cells of 16-28 × 3-8 µm. Asci 183-221 × 16-20 µm, cylindrical to clavate, rounded at apex, short-pedicellate at the base, hyaline, thin walled, octosporic, inamyloid. Ascospores 119-127 × 5-7 µm, filiform, mostly 9-11 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 on soil under Manilkara zapota in urban vegetation.

Notes.

This species differs from other species by the caespitose ascomata, paraphyses with rugose and coiled tips, and the ascospores of 119-127 × 5-7 µm with 9-11 septa. Trichoglossum rasum Pat. is morphologically similar by the octosporic asci, clavate spathulate ascoma with dark brown hues, and the tropical distribution but it differs in the bigger ascomata (10-60 mm), smaller setae (200-250 × 5-12 µm), larger ascospores (100-140 × 5-8 µm) with 3-7 septa ( Mains 1954). Trichoglossum octopartitum Mains can also be found in the Yucatan peninsula biotic province and shows similar ascoma and ascospore size; nevertheless, the ascomata is never caespitose ascomata and shows 7-septate ascospores ( Mains 1954; Ekanayaka et al. 2017). Trichoglossum confusum E.J. Durand has also similar ascoma size but differs in the smaller ascospores (57-75 × 5-7 µm) with 3-7 septa ( Mains 1954).

Figures

Figure 3. Trichoglossum caespitosum (Holotype) A, B ascomata C paraphyses, setae, and asci D detail of asci E ascospores. 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.