Gymnosporangium kanas 2020

Gymnosporangium kanas P. Zhao & L. Cai 2020

MycoBank MB831270

Holotype: China, Xinjiang, Altay Prefecture, Kanas Lake, aecial stage on Cotoneaster dammeri, 16 Aug. 2016, P. Zhao (holotype HMAS248105). SSU, ITS and LSU sequences GenBank MK488124, MK518825 and MK518469.

Morphological description

Spermogonia Group (type 4), foliicolous, epiphyllous, subepidermal, determinate, black or dark brown, 0.1–0.4 mm, with strongly concave hymenia, bounding structures with well-developed periphyses. Aecia Roestelia-type, fructicolous, roestelioid, white finger-like tubes develop all over fruit, 4–7 mm high, tubular, rupturing at apex; peridium cylindrical, retaining more or less tubular shape, erect or spreading, peridial cells verrucoserugose, 39–91 µm long, 19–27 µm wide, aeciospores globoid or broadly ellipsoid, 20–28 × 16–22 µm, verrucose, walls 1.5–3 µm thick. Uredinia and telia not found.

Habitat: On Cotoneaster dammeri.

Distribution: In China.

GenBank Accession: 

Notes:

Reference: P. Zhao¹, X.H. Qi ², P.W. Crous^3,4 et al.

Morphology of G. kanas. a. Spermogonia (S) on the epiphyllous leaf surface; b. aecia only found on fruits; c. peridia cells (P) on fruits; d. globoid or ellipsoid urediniospores observed by light microscope, germ pores (G) scattered; e. peridial cells cylindrical, retaining more or less tubular shape, verrucoserugose. — Scale bars: a–c = 0.5 mm; d–e = 20 µm.