Puccinia iporangae A.A. Carvalho & J.F. Hennen, 2018

De Carvalho-Junior, Anibal A. & Hennen, Joe F., 2018, Puccinia on Ipomoea (Convolvulaceae) in Neotropics, Phytotaxa 344 (2), pp. 133-148 : 140

7. Puccinia iporangae A.A. Carvalho & J.F. Hennen sp. nov. Figure 2 K− M (Holotype).

MycoBank:—MB 819323

Type:— BRAZIL. São Paulo: Piracicaba , July 1909, on Ipomoea indica (Burm.) Merr., A. Puttemans 3576 (Holotype: PUR!; Isotype: RB!) .

The new species can be readily distinguished from the other by the presence of urediniospores pedicelate and echinulate 27–33(–39) × 21––25 μm; teliospores (50–)57–65 × 27–33(–40) μm, well-spaced verrucose, slightly constricted at septum, wall one-layered, 3–5 μm and apex with 8–12 μm.

Spermogonia and aecia unknown. Uredinia ( Uredo type) on both sides of leaves, mostly on abaxial side, scattered singly, erumpent, 0.2–1.0 mm across, ruptured epidermis not evident, pulvinate, cinnamon-brown, powdery; urediniospores pedicellate 27–33(–39) × 21––25 μm, obovoid, ellipsoid, or globoid; wall 1.5–2.5 μm thick, evenly echinulate, golden-brown; pores 3, equatorial covered with echinulate cuticular caps. Telia on both sides, mostly on abaxial side, scattered isolated or in uredinia, erumpent, 0.2–1.0 mm across, ruptured epidermis not evident, pulvinate, dark brown, powdery; teliospores (50–)57–65 × 27–33(–40) μm, chestnut-brown, ellipsoid or broadly ellipsoid, slightly constricted at septum; wall 3–5 μm and apex with 8–12 μm, short and well-spaced verrucose, germ pore apical in upper cell, at septum in lower cell; pedicel up to 60 μm long, hyaline. Life cycle (?/?, IIpe, III).

Additional specimens examined ― BRAZIL. Rio de Janeiro: Teresopolis, 6 Oct 1921, on Convolvulus sp. , E. W.D. Holway and M. M. Holway 1198 ( PUR 7112). Minas Gerais: Caldas, Hotel Itacor, on the mountain trail to the TV tower, on Ipomoea sp. , Joe F. Hennen and Mary M. Hennen 83−786 ( IBI 14933, PUR 87678). São Paulo: Moji das Cruzes, 14 Sep 1976, on I. aristolochiifolia G. Don, Joe F. Hennen and Mario B. Figueiredo 76−375 ( IBI 12572); Apiaí, about 10 km from Apiaí on the road to Barra do Chapéu, 23 Mar 1988, on I. indica, Joe F. Hennen and Mary M. Hennen 98−138 ( IBI 18154); Ribeirão Grande, along dirt road off road from Ribeirão Grande to Sumidouro (about 2 km W of Sumidouro), on I. indica, Joe F. Hennen, Mary M. Hennen and Anibal A. Carvalho Jr. 98−174 ( IBI 18190); Iporanga, on road from Iporanga to Apiaí, 26 km from Iporanga, 26 Jul 1998, on I. indica, Joe F. Hennen and José R. Hernández 98−480 ( IBI 18497).

Etymology — “Iporangae ” comes from Iporanga, a city in which the last examined material was collected.

Notes and taxonomic affinities — Castagne (1842) described P. convolvuli from Miramas, France. Jackson (1931) mistakenly reports P. convolvuli on Convolvulus sp. , from Rio de Janeiro (with uredinia and a few teliospores). Recently, through new examination of material identified by Jackson, we concluded that it belongs to the new species P. iporangae . Similarly, Uredo ipomoeicola Lindq. , ( Lindquist 1965, p. 122) has urediniospores very similar to P. iporangae and also probably belongs here.

Puccinia iporangae has urediniospores pedicelate and echinulate ( Uredo type), not Aecidium form as most other species on Ipomoea . Uredo spp. have been reported as anamorphs connected to six rust teleomorphs on Convolvulaceae in the Americas: P. convolvuli Cast. on Convolvulus from Africa, China, Europe, Brazil (from Brazil now P. iporangae ), Japan, the Middle East, and North America ( Arthur 1907 − 1921; Hennen et al. 2005); P. jalapensis on Ipomoea from Mexico; P. lithospermi Ellis & Kellerm. on Evolvulus from southern United States of America, throughout tropical America and in Argentina, Bolivia and Uruguay ( Hennen et al. 2005; Lindquist 1982); P. tuyutensis Speg. on Cressa from Argentina to the United States of America, the Mediterranean region, and the Middle East ( Hennen et al. 2005); P. simasii Rangel on Jaquemontia from Brazil ( Hennen et al. 2005); Uromyces brasiliensis Trotter on Jaquemontia from Ecuador, Venezuela, the West Indies, Central America, Mexico, New Guinea, Taiwan, and the Phillipines ( Hennen et al. 2005), and Uromyces vicinus on Ipomoea from Brazil ( Hennen et al. 2005).

Puccinia iporangae differs from other species of Puccinia on Convolvulaceae in the Americas mainly by having pedicellate and echinulate urediniospores and larger teliospores; from P. simasii and P. tuyutensis by having longer length and width, and thicker wall teliospores at the apex; from P. lithospemi , P. convolvuli and P. jalapensis by larger lateral walls and teliospores with greater width. From asian P. heitoensis differs by larger teliospores, thicker walls and presence of urediniospores.

Figures

FIGURE 2. A−E. Puccinia hyalostrata (Holotype). A. Peridium. B−C. Urediniospores. B. Median focus. C. Surface focus. D−E. Teliospores. D. Median focus. E. Surface focus. F−H. P.ibrae. F−G. Urediniospores. F. Median focus. G. Surface focus; H. Teliospores in median focus. I−J. P. insignis (Holotype). I. Teliospores on median focus; above and left, peridium. J. Surface focus. K−M. P. iporangae (Holotype). K−L. Urediniospores. K. Median focus. L. Suface focus. M. Teliospores. Bars: A−I, M=20μm; K-L, J =10μm.