Asian Rubus rust-Hamaspora hashiokai

This is one of the numerous Hamaspora rust fungi on Rubus in Asia that does not appear to be harmful to economically important species of Rubus.

Hamaspora hashiokai Hirats. f., 1935

Uredinia hypophyllous (on lower surface of leaves), scattered, minute, more or less round, 0.3-0.6 mm diam, subpulverulent, yellow-cinnamon; urediniospores obovate, ellipsoid to oblong, 30-56 × 12-42 µm, acute-echinulate, spore wall 1-2 µm thick, thickened apex 5-7.5 µm.

Telia hypophyllous, densely gregarious, caespitose, filiform, up to 3 mm long, yellowish; teliospores obclavate to acicular, 2-3-septate, cell apex more or less long-acute, smooth, hyaline to subhyaline, 50-110 × 12-20 µm, apical cell 2.5-5 × 2.5-5 µm; spore wall 1.5-2 µm thick, one germ pore per cell, pedicel long, 12-18 µm thick, hyaline.

See Hiratsuka & Hashioki (1935) and Monoson (1969) for a more detailed description.

Host range: Uredinial and telial stage: Rubus lambertianus Ser. Rubus sp. Rubus taitoensis Hayata var. aculeatiflorus (Hayata) H. Ohashi & C.F. Hsieh Rubus taiwanianus Matsum. Rubus xanthoneurus Focke ex Diels

Geographic distribution: China, Japan and Taiwan

This fungus is similar to Hamaspora longissima in general characteristics of the teliospores. However, H. hashiokai has teliospores with a thick-walled apex and obovate, ellipsoid to oblong urediniospores, 32-56 × 12-42 µm, while the teliospores of H. longissima have a thin-walled apex and the globose urediniospores are 23-30 × 18-28 µm (Monoson, 1969).

References:

Hiratsuka, N., and Hashioka, Y. 1935. Uredinales collected in Formosa IV. Bot. Mag. 49: 520-567.

Monoson, H.L. 1969. The species of Hamaspora. Mycopathol. Mycol. Appl. 37: 263-272.

Zhang, N., Zhuang, J.-Y., and Wei, S.-X. 1997. Fungal flora of the Daba Mountains: Uredinales. Mycotaxon 61: 49-79.

Nomenclature

Specimens in BPI

Additional distribution data

Suggested citation: Yun, H.Y. Systematic Mycology and Microbiology Laboratory, ARS, USDA. . Invasive Fungi. Asian Rubus rust-Hamaspora hashiokai. Retrieved November 21, 2009, from http://nt.ars-grin.gov/sbmlweb/fungi/index.cfm .