Cerotelium diospyri Beenken, 2017

Beenken, Ludwig, 2017, Redetermination of host plants reveals that the rust fungi Aecidium annonae, Aecidium chrysophaeum and Cerotelium xylopiae occur on Diospyros species (Ebenaceae) instead of Annonaceae, Phytotaxa 313 (3), pp. 249-258 : 256

Cerotelium diospyri Beenken sp. nov.

Mycobank no. MB805029 Fig. 4b− f

= Cerotelium xylopiae Buriticá & Hennen in Buriticá, Acad. Colombia Cienc. Rev. Acad.

Colombia Cienc. 23: 417. 1999 (name is not validly published according to McNeill et al. 2012, Art. 40.7).

Etymology:— name refers to the host genus Diospyros .

Spermogonia, aecia and uredinia unknown.Telia on abaxial leaf sides in groups 3–15 mm in diameter; subepidermal telia breaking through the epidermis of the host leaf, gelatinous, yellowish to light brown (older telia appears often blackish caused by a dark brown, septate hyphomycetes), 0.2–0.5 mm in diameter; teliospores generated in chains later free and more or less irregularly imbedded in a gelatinous matrix, in 3–5 layers, teliospores ellipsoid, ovoid to pyriform, (17)24–29.4–36(41) × (11)12–14.9–16(23) μm, wall colourless, hyaline, ca. 0.5 μm thick, germ pores obscure; distal teliospores immediately germinating with basidia. Basidia ca. 70–80 × 12–15 μm, basidiospores globose to subglobose 12–15 μm in diameter. M-haustoria, intracellular haustorial bodies ovoid to oblong, 5–10 × 3–5 μm, with a terminal, up to 2 μm thick, thin-walled appendix.

Host and distribution:—on Diospyros sericea A. DC. (det. L. Beenken, conf. B. Wallnöfer) in cerrado vegetation of Brazil, known from Federal district and Goiás. Hosts were misinterpreted as Xylopia sp. ( Buriticá 1999).

Holotype:— BRAZIL. Federal District, National Park Aquas Emendadas, NE of Brasilia, forest along small stream, 4 Aug 1976, leg. J. F. Hennen , Y. Ono , E. Heringer 76-256 ( PUR 66525 c) ( III, IV).

Additional specimens:— BRAZIL. Federal District, National Park Aquas Emendadas, NE of Brasilia , in tall forest along stream, more or less cerrado on higher ground, 15 Oct 1976, leg. J. F. Hennen, M. M. Hennen 76-492 ( PUR 66524 c) ( III) ;—, 4 Aug 1976, leg. J. F. Hennen, Y. Ono, E. Heringer 76-258 ( PUR 66526 c) ( III) ; Goiás, Highway 153, 59 km S of Santa Teresa , 6 Dec 1977, leg. J. F. Hennen, M. M. Hennen 77-355 ( PUR 66527 ) ( III) .

Figures

FIGURE 4. Cerothelium diospyri: a–b. Comparison of size and shape between leaves of a. Xylopia sericea A. St.-Hill. (Annonaceae) infected by Dasyspora winteri (Pazschke) Beenken and b. Diospyros sericea (Ebenaceae) infected by Cerothelium diospyri. Upper leaf side is shown on the left and lower side is shown on the right. c–f. Telia of Cerotelium diospyri on Diospyros sericea (holotype); c. Telium breaking through the papillate leaf epidermis, in section; d. teliospores in gelatinous matrix; e. germinating teliospore; f. drawings of two teliospores germinating with basidia, with two of the six basidiospores germinating.