Triscelophorus monosporus Ingold, Trans. Br. Mycol. Soc.

Fiuza, Patrícia O., Cantillo-Pérez, Taimy, Gulis, Vladislav & Gusmão, Luís F. P., 2017, Ingoldian fungi of Brazil: some new records and a review including a checklist and a key, Phytotaxa 306 (3), pp. 171-200 : 189

Triscelophorus monosporus Ingold, Trans. Br. Mycol. Soc. 26:152, 1943.

( Fig. 7H )

Material examined: — BRAZIL. Bahia: Piatã, Chapada Diamantina, on submerged leaves of Calophyllum brasiliense ( Calophyllaceae ), 10 July 2014, P. O. Fiuza s.n ( HUEFS 215907).

Conidia tetraradiate, hyaline, comprised by the main axis and three branches attached to its basal cell, main axis 1-septate, tapering toward the apex, not constricted at the septum, apical cell 45–60 × 3.5–4 μm; doliiform basal cell with truncated base, 5–7 × 4.5–5 μm; branches cylindrical, slightly constricted at the base, aseptate, 37–45 × 2.5–3 μm.

Geographical distribution:— Cosmopolitan.

Notes:— Triscelophorus monosporus is the type of the genus composed by eight species ( Matsushima 1993). The conidia of T. monosporus are similar to T. acuminatus Nawawi (1975: 346) , both have a slightly tapering main axis with doliiform basal cell, but in the latter, the axis is multiseptate, while in T. monosporus it is typically 1-septate (rarely with no septum). In Brazil, five species of Triscelophorus ( Table 2) have been recorded, including T. monosporus from the state of São Paulo. Triscelophorus monosporus is a new record to the Caatinga.

Figures

FIGURE 7. A. Tricladium gracile: conidium; B. Tricladium splendens: conidium; C. Trinacrium incurvum: conidium; D. Triscelophorus acuminatus: conidium; E. Triscelophorus curviramifer: conidium; F. Triscelophorus deficiens: conidium; G. Triscelophorus magnificus: conidium; H. Triscelophorus monosporus: conidium; I. Trisulcosporium acerinum: conidium; J. Varicosporium elodeae: conidium.(Scale bar: A–B, D, G–J= 20 μm; C= 25 μm; E–F= 10 μm)