Pleosporales » Torulaceae » Torula

Torula gaodangensis

Torula gaodangensis J. Yang & K.D. Hyde

Index Fungorum number: IF 553199; Facesoffungi number: FoF 03288

Etymology: referring to the collecting site, Gaodang village.

Holotype: MFLU 17-0858

 

Saprobic on decaying twigs. Asexual morph Colonies effuse, dark brown to black, powdery. Mycelium immersed or superficial, consisting of branched, septate, smooth, hyaline to pale brown hyphae. Conidiophores macronematous or semi-macronematous, mononematous, erect, straight, solitary, pale brown to mid brown, smooth and thin-walled, aseptate, arising from hypha, cylindrical, slightly narrower towards to the apex, with a darkened scar at the apex connecting with conidiogenous cells, 1–1.9(–7.5) × 2–2.8 µm ( = 1.4 × 2.4 µm, n = 15). Conidiogenous cells monoblastic-acropetal, integrated, terminal, dark brown, inflated, oblate-sphaeroid or coronal with flat base and collapsing apex, verruculose, 5.3–7.9 (diam) × 3–5.3 µm ( = 6.8 × 4 µm, n = 25). Conidia acrogenous, 4–8-euseptate, guttulate, straight or slightly curved, cylindrical, constricted at the septa, slightly broader at middle cells, rounded at the apex, while truncate at the base, with a darkened scar and central pore at the base or side of the basal cell, 20–35 × 6–7.5 µm ( = 27.5 × 6.8 µm, n = 35), yellowish-brown, verruculose. Sexual morph Undetermined. (Descriptions from Dong et al. 2020)

 

Culture characteristics: Conidia germinating on PDA within 24 h Germ tubes produced from both ends. Colonies on PDA reaching 5–10 mm diameter after one week at 25 °C in natural light, circular, matte, greyish-brown on the surface, with brown, sparse mycelium at the entire margin, dark brown in reverse. Aerial and submerged hyphae 2.5–5.5 µm wide, smooth, subhyaline, thin-walled, sparsely branched. Sporulation absent. On vegetative hyphae are formed pale to mid brown, globose to ellipsoidal chlamydosporous cells 10–18 µm diameter, thick-walled, arranged in chains or moniliform. (Descriptions from Dong et al. 2020)

 

Material examined: CHINA, Guizhou Province, Anshun city, Gaodang village, 26°4′16″N, 105°41′53″E, on decaying wood submerged in Suoluo River, 19 October 2016, J. Yang, GD 24-3 (MFLU 17-0858, holotype); ibid., (GZAAS 17-0011, isotype), ex-type living cultures MFLUCC 17-0234, GZCC 17-0051.

 

Notes: Combined LSU and ITS phylogenetic analyses strongly support Torula gaodangensis as a sister taxon to T. herbarum within Torulaceae. Torula herbarum is characterized by globose, mono- to polyblastic conidiogenous cells and chain-like, percurrent proliferating conidia, while T. gaodangensis has oblate sphaeroid, monoblastic conidiogenous cells without proliferating conidia. Torula ficus Crous is similar to T. gaodangensis but differs in having mono- to polyblastic conidiogenous cells and branched chain-like conidia. In conidial shape, T. gaodangensis resembles T. terrestris Misra, however, the conidiogenous cells of T. terrestris are paler and globose and the basal cells of conidia are rounded without darkened scar. (Notes from Dong et al. 2020)

 

Freshwater distribution: China (Hyde et al. 2017)