Tropical Asian Rubus rust-Hamaspora rubi-sieboldii

A number of rust fungi in the genus Hamaspora occur on Rubus in Asia, none of which appear to cause serious diseases. They are all characterized by having very long teliospores with an acute apex and are differentiated by teliospore length, septation, and apical characteristics. Most have hyaline paraphyses but H. rubi-sieboldii has brown paraphyses.

Hamaspora rubi-sieboldii (Kawagoe) Dietel 1922

Spermogonia and aecia unknown.

Uredinia subepidermal, hypophyllous (on lower surface of leaves), sparse, pale yellow to brown, pulverulent, powdery, with peripheral paraphyses, many connected at their base, bacilliform or clavate, sickle-shaped, chestnut-brown, 6-13 × 22-55 µm, wall 2 µm thick.

Urediniospores oval, pyriform, oblong, obovoid, 15-30 × 12-23 µm; walls golden to cinnamon brown, 1 µm thick, moderately echinulate, without distinct germ pores.

Telia hypophyllous, felt-like, up to 2 mm long.

Teliospores obclavate to acicular, hyaline. 3-5-septate, mostly 4-septate, 118-240 × 5-23 µm long, constricted at septum, apical cells 5-25 × 2.5 µm long, acuminate at apices, walls hyaline, smooth, 2 µm thick, germ pores 1 per cell, pericels persistent, up to 2000 µm long.

See Monoson (1969) and Hiratsuka (1992) for a more detailed description.

Host range: Rubus alceifolius Poir. (giant bramble), R. columellaris Tutcher, R. ellipticus Sm. (yellow raspberry), R. formosensis Kuntze, R. macgregorii F. Muell., R. multibracteatus H. Lév. & Vaniot, R. pectinellus Maxim., R. phoenicolasius Maxim. (winberry), R. pinfaensis H. Lév. & Vaniot, R. reflexus Ker Gawl., R. sieboldii Blume, Rubus spp.

Geographic distribution: China (Zhuang et al., 2001); India, Assam, Manipur (Goswami & Singh, 1973); Japan, Honshu, Kyushu, Okinawa/Ryukyu Archipelago, Shikoku (Hiratsuka et al., 1992); Papua/New Guinea (Cummins, 1940); Philippines (Teodoro, 1937); Taiwan (Anonymous, 1979).

References:

Anonymous 1979. List of plant diseases in Taiwan. Pl. Protect. Soc., Republ. of China, 404 pages.

Cummins, G.B. 1940. Uredinales of New Guinea. Mycologia 32: 359-375.

Goswami, R.N., and Singh, K.L. 1973. Uredinales of north-east India. Indian Phytopathol. 26: 310-314.

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

Sydow, H., and Petrak, F. 1931. Micromycetes Philippinenses. Ann. Mycol. 29: 145-279.

Teodoro, N.G. 1937. An Enumeration of Philippine Fungi. Techn. Bull. Dept. Agric. Comm. Manila 4: 1-585.

Zhuang, W.-Y., Ed. 2001. Higher Fungi of Tropical China. Mycotaxon, Ltd., Ithaca, NY, 485 pages.

Nomenclature

Specimens in BPI

Additional distribution data

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