Aecidium chrysophaeum Syd., Annal. Mycol.

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 : 253-256

Aecidium chrysophaeum Syd., Annal. Mycol. 37: 323 (1939) Fig. 3

Spermogonia adaxial, light brown to black, of group VI, type 5, subepidermal, disc shaped to convex, 180–300 × 80–100 μm. Aecia of Aecidium type, on abaxial leaf sides in groups of 3–10 mm diameter, forming convexities within black spots on adaxial leaf sides, 0.17–0.25 mm in diameter, surrounded by white cup to tube shaped peridium split into several lobes; aeciospores nearly cubic with rounded corners or ovoid, 16–18.7–21 × 14–16.7–22 μm, length-width ratio 0.8–1.13–1.4, wall 0.3–0.5 μm thick, distal wall 4–7 μm thick, colourless to pale yellow, ornamentation minutely verruculose, refracting cylindrical bodies lacking. Peridial cells in longitudinal section 15–23 μm long, 12–13 μm wide, wall at the inner side 1–3 μm thick, smooth, walls at the outer side 0.5–1 μm thick and 3–4 μm high, 0.5–1 μm thick rod-like warts densely tuberculate, peridial cells in plan view scale-like arranged, rhomboid to spindle-shaped, 16–23 μm high, 25–40 μm wide, walls of inner sides smooth, ornamentations of outer sides appear dotted and net-like in parts. M-haustoria, intracellular haustorial bodies ovoid to oblong, 5–10 × 2–3 μm, with a terminal, ca. 1 μm thick, thin-walled appendix.

Host and distribution: on Diospyros artanthifolia Mart. s.l. (det. B. Wallnöfer) in the Amazonian part of Ecuador. The host was mislabelled as Rollinia cf. cardiantha Diels.

Lectotype (designated here): ECUADOR. Prov. Napo-Pastaza, Puyo , alt. 700−750m, 14 Feb 1938, leg. H. Sydow, Fungi Aequatorienses no. 850 ( ZT Myc 49001) (0, I) ; Isotypes: ECUADOR. Prov. Napo-Pastaza, Puyo , 14 Feb 1938, leg. H. Sydow , Sydow, Fungi exotici exsiccati no. 1129 ( B 700014120 , BRUX 76648.18 , M 0142432 , S F18948 , W 1974 No. 03278, W 1944 No. 954, ZT Myc 49002) (0, I) ; ex Herb. H. Sydow ( NY 00610986 ) (0, I) .

Note: Sydow (1939) designated “Fungi Aequatorienses no. 850” as type. Sydow’s “Fungi exotici exsiccati no. 1129” shows the same location and date on the label, and thus it seems to be a later section of the same collection (cf., Petrak 1948). Thus, the specimens labelled with “Fungi exotici exsiccati no. 1129” were also designated as isotypes.

Figures

FIGURE 3. Aecidium chrysophaeum: a. Infected leaves of Diospyros artanthifolia (lectotype). c. Subepidermal spermogonium in section. c–f. Aecia: c. aecium in section; d. aeciospores with enlarged distal wall, insert shows single spore with lumen stained by cottonblue; e. inner side of peridial cells in face view; f. outer side of peridial cells in face view and optical section.