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Sori and spores of Ravenelia ornata. A, C, F on Abrus precatorius (BKF P0022); B, E on Abrus sp. (BKF P0003); D, G, H on Ab. pulchellus (BKF P0084). A: Vertical section of subcuticular spermogonium. B: Vertical section of aecium, showing peripheral paraphyses. C: Aeciospores with scattered germ pores. D: Urediniospores (SEM), showing echinulate surface. E: Upper face view of teliospores. F: Side view of teliospore, showing central two-celled probasidia, marginal one-celled probasidia, and subtending cysts. G: Upper surface view of teliospore (SEM), showing short columnar tubercles on central probasidia and long conical, apically swollen appendages at periphery. H: Lower surface view of teliospore (SEM), showing collapsed, uniseriate cysts and conical, apically swollen appendages at periphery. Bars: A, B, E, F 50 mm; C, G, H 20 mm; D 10 mm.
Source publication
Three poorly known species of Ravenelia with limited geographic distribution and one widespread species parasitizing leguminous trees (Fabaceae) were newly found in Thailand. Ravenelia odoratissimae occurred on Albizia odoratissima; R. ornata on Abrus pulchellus, Ab. precatorius, and Abrus sp.; R. parasnathii on Acacia comosa and an unidentified Ac...
Contexts in source publication
Context 1
... no.: MB 171879. Spermogonia produced on both leaf surfaces, subcuticular, conical with flat hymenium, 34e85 mm wide, and 21e52 mm high ( Fig. ...
Context 2
... Uredo-type produced on abaxial leaf surface, subepidermal in origin, erumpent, and paraphysate at periphery; paraphyses cylindrical or spathulate, and 27e64 Â 6e18 mm in size (Fig. 2B); the wall light yellowish brown to light chestnut-brown, often darker apically, and 1e2 mm thick. Aeciospores pedicellate, globose or subglobose, and 14e19 Â 14e19 mm in size (Fig. 2C); the wall yellowish brown to light chestnut-brown, 1e1.5 mm thick, and minutely echinulate; germ pores mostly 6 and scattered (Fig. 2C). Uredinia ...
Context 3
... produced on abaxial leaf surface, subepidermal in origin, erumpent, and paraphysate at periphery; paraphyses cylindrical or spathulate, and 27e64 Â 6e18 mm in size (Fig. 2B); the wall light yellowish brown to light chestnut-brown, often darker apically, and 1e2 mm thick. Aeciospores pedicellate, globose or subglobose, and 14e19 Â 14e19 mm in size (Fig. 2C); the wall yellowish brown to light chestnut-brown, 1e1.5 mm thick, and minutely echinulate; germ pores mostly 6 and scattered (Fig. 2C). Uredinia scattered on the abaxial leaf surface, subepidermal in origin, erumpent, peripherally paraphysate, and erumpent; paraphyses similar to aecial paraphyses. Urediniospores pedicellate, globose, ...
Context 4
... and 27e64 Â 6e18 mm in size (Fig. 2B); the wall light yellowish brown to light chestnut-brown, often darker apically, and 1e2 mm thick. Aeciospores pedicellate, globose or subglobose, and 14e19 Â 14e19 mm in size (Fig. 2C); the wall yellowish brown to light chestnut-brown, 1e1.5 mm thick, and minutely echinulate; germ pores mostly 6 and scattered (Fig. 2C). Uredinia scattered on the abaxial leaf surface, subepidermal in origin, erumpent, peripherally paraphysate, and erumpent; paraphyses similar to aecial paraphyses. Urediniospores pedicellate, globose, subglobose or broadly ellipsoid, and 14e21 Â 12e21 mm in size; the wall yellowish brown to light chestnut-brown, 1e2 mm thick, minutely ...
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... Uredinia scattered on the abaxial leaf surface, subepidermal in origin, erumpent, peripherally paraphysate, and erumpent; paraphyses similar to aecial paraphyses. Urediniospores pedicellate, globose, subglobose or broadly ellipsoid, and 14e21 Â 12e21 mm in size; the wall yellowish brown to light chestnut-brown, 1e2 mm thick, minutely echinulate (Fig. 2D); germ pores mostly 6 and scattered. Telia produced on the abaxial leaf surface, subepidermal in origin, erumpent, and peripherally paraphysate; paraphyses similar to aecial paraphyses. Teliospores shortpedicellate, 3e7-probasidium cells across, and 49e110 mm across, and 40e94 mm high (Fig. 2E); central probasidium cells bicellular by ...
Context 6
... chestnut-brown, 1e2 mm thick, minutely echinulate (Fig. 2D); germ pores mostly 6 and scattered. Telia produced on the abaxial leaf surface, subepidermal in origin, erumpent, and peripherally paraphysate; paraphyses similar to aecial paraphyses. Teliospores shortpedicellate, 3e7-probasidium cells across, and 49e110 mm across, and 40e94 mm high (Fig. 2E); central probasidium cells bicellular by oblique septa (Fig. 2F), individual probasidium cells 11e33 mm high and 8e26 mm wide; the wall brown to dark reddish brown, 2e5 mm thick, ornamented with short columnar tubercles (up to 5 mm high) on central probasidium cells and long conical, apically swollen appendages (up to 20 mm long) at ...
Context 7
... germ pores mostly 6 and scattered. Telia produced on the abaxial leaf surface, subepidermal in origin, erumpent, and peripherally paraphysate; paraphyses similar to aecial paraphyses. Teliospores shortpedicellate, 3e7-probasidium cells across, and 49e110 mm across, and 40e94 mm high (Fig. 2E); central probasidium cells bicellular by oblique septa (Fig. 2F), individual probasidium cells 11e33 mm high and 8e26 mm wide; the wall brown to dark reddish brown, 2e5 mm thick, ornamented with short columnar tubercles (up to 5 mm high) on central probasidium cells and long conical, apically swollen appendages (up to 20 mm long) at periphery (Fig. 2G); cysts subtending teliospores, nearly equal in ...
Context 8
... 2E); central probasidium cells bicellular by oblique septa (Fig. 2F), individual probasidium cells 11e33 mm high and 8e26 mm wide; the wall brown to dark reddish brown, 2e5 mm thick, ornamented with short columnar tubercles (up to 5 mm high) on central probasidium cells and long conical, apically swollen appendages (up to 20 mm long) at periphery (Fig. 2G); cysts subtending teliospores, nearly equal in number to probasidium cells, uniseriate, fused at sides, colorless, and hygroscopic (Fig. 2F, H & Rao, 1998); on Ab. pulchellus, India (Hosagoudar, 1988;Kapoor & Agarwal, 1972;Pande & Rao, 1998;Ragunathan & Ramakrishnan, 1973;Sydow, Sydow, & Butler, 1906); on Ab. pulchellus subsp. mollis ...
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... to dark reddish brown, 2e5 mm thick, ornamented with short columnar tubercles (up to 5 mm high) on central probasidium cells and long conical, apically swollen appendages (up to 20 mm long) at periphery (Fig. 2G); cysts subtending teliospores, nearly equal in number to probasidium cells, uniseriate, fused at sides, colorless, and hygroscopic (Fig. 2F, H & Rao, 1998); on Ab. pulchellus, India (Hosagoudar, 1988;Kapoor & Agarwal, 1972;Pande & Rao, 1998;Ragunathan & Ramakrishnan, 1973;Sydow, Sydow, & Butler, 1906); on Ab. pulchellus subsp. mollis (Hance) Verdc. (¼ Ab. mollis Hance), China (Tai, 1979); on Ab. precatorius, China (Tai, 1979;Zhuang, Wei, & Wang, 2012); India (Kapoor & ...
Citations
... The genus Ravenelia is the third largest genus in the Pucciniales, comprised of some 200 accepted species (Ayawong et al. 2020). The species are distributed in subtropical and tropical regions around the world. ...
Hapalophragmium derridis occurs on Derris trifoliata (Fabaceae). It is widely distributed in coastal regions of subtropical and tropical Asia and Africa. In Japan, this fungus had been known only in the Miyako Island until it was discovered in the Iriomote Island in 2013. During the fixed-site observations in the Iriomote Island in the years from 2013 through 2019, the fungus was found to produce subcuticular spermogonia and Malupa-type aecia together with Malupa-type uredinia and telia on the same individual vine of D. trifoliata. This discovery is the first to prove the autoecious macrocyclic life cycle of H. derridis. Ravenelia hobsonii occurs on Pongamia pinnata (Fabaceae) also in coastal regions of subtropical and tropical Asia. In Japan, it has been recorded from the Okinawa Islands and the Sakishima Islands. During the fixed-site observations in the islands of Ishigaki and Iriomote in the years of 2013 and 2914, the fungus was found to produce
subcuticular spermogonia and Uredo-type aecia together with Uredo-type uredinia and telia on the same individual trees of P. pinnata. This discovery is the second to prove the production of
spermogonia in R. hobsonii. This paper describes its complete life cycle for the first time.
... The microscopic slides for observation and measurement of sorus structure, spores, and paraphyses were prepared by methods described by Pota et al. (2015) and Ayawong et al. (2020). For visualizing faint germ pores, urediniospores were placed in a drop of lactic acid on a slide glass and heated to boiling for a few seconds and mounted with a drop of lactophenol solution with 0.5% aniline blue (Pota et al. 2013). ...
Rust fungi on commercial Vitis cultivars, wild Vitaceae, and Meliosma (Sabiaceae), potential alternate hosts of a grapevine leaf rust (GLR) fungus, were surveyed in Thailand and Vietnam. Molecular phylogenetic analyses using the internal transcribed spacer 2 and the large-subunit rRNA gene (D1/D2 region) and morphological examinations confirmed that the GLR fungus distributed in Southeast Asia and Australasia is distinct from Neophysopella species involved in GLRs in East Asia and the Americas. Therefore, the Southeast Asian-Australasian GLR fungus is recognized as a new Neophysopella species and named as N. tropicalis. Two fungi on Meliosma species in Thailand were aecial anamorph of Neophysopella species. One parasitic on M. simplicifolia and M. simplicifolia subsp. fordii was previously named as Aecidium wareoense, and a new name, N. wareoensis, is proposed for it. Another on M. arnottiana in Thailand was phylogenetically and morphologically distinct from all other Meliosma rust fungi, and, therefore, it is recognized as a new species, N. sriphumensis. A uredinial-telial fungus on Ampelocissus araneosa (Vitaceae) in Thailand was morphologically similar to Phakopsora cronartiiformis on Parthencissus semicordata (Vitaceae) in the Himalayas. However, the former fungus was distinct from the latter in producing characteristic urediniospores with labyrinthiform surface structure and cone-shaped projections. It is, therefore, recognized as a new species, N. doipuiensis.
