Chrysomyxa succinea (Sacc.) Tranz., Consp. Ured. URSS, Moscow

Cao, Jing, Tian, Cheng-Ming, Liang, Ying-Mei & You, Chong-Juan, 2017, Two new Chrysomyxa rust species on the endemic plant, Picea asperata in western China, and expanded description of C. succinea, Phytotaxa 292 (3), pp. 218-230 : 225-227

Chrysomyxa succinea (Sacc.) Tranz., Consp. Ured. URSS, Moscow , p.70, 314. 1939. ( Fig. 5 )

Specimens examined: — CHINA, Shaanxi Province: Ningshan County, on Picea wilsonii Mast. ( Pinaceae ), 10 August 2015, coll. J. Cao (BJFC-R02306; BJFC-R02307).

Spermogonia unknown.

Aecia hypophyllous, in 2 rows on yellow lesions, elongate, laterally compressed.Aeciospores globose, subglobose, ellipsoidal or slightly ovoid, 18–34 × 13–23 μm, wall plus warts 1.0–2.8 μm thick ( Fig. 5A ); aeciospores with a broad shallow cap at one or both ends, the broad longitudinal area with a broken, skirt-like edge ( Fig. 5B ); warts cylindrical, annulate, with smooth or rough tops ( Figs 5C, 5D ); peridium persistent, cells overlapping, polygonal, round or square, outer surface flat, smooth ( Fig. 5E ); inner surface with raised edges, warts distinct and densely crowded ( Fig. 5F ).

Notes:— Chrysomyxa succinea was described by Saccardo (1880) as Gloeosporium succineum , and then transferred to Chrysomyxa by Tranzschel (1939). Detailed morphological descriptions of uredinia and telia stage were provided by Crane (2005b), but no confirmed material of the spermogonia and aecia stage from inoculations was examined ( Hiratsuka et al.1992, Crane 2005b). During our survey, Chinese specimens collected on needles of P. wilsonii were morphologically identified and proved by molecular phylogenetic analysis to be the aecial stage of C. succinea . The type specimen of C. succinea is not available, but morphological examinations of the three paratype specimens (HMAS 6142, HMAS 6145, HMAS 58633) showed that the morphological characteristics fit well with the description by Crane ( Crane 2005b). The present study also demonstrated that P. wilsonii is the first host record for C. succinea in China.

Figures

FIGURE 5. Chrysomyxa succinea (BJFC-R02306). A. Aeciospores observed by LM. B. Aeciospores observed by SEM,showing broad longitudinal area or cap;C. crowded,cylindrical warts with smooth or rough tops. D. Aeciospores with warts cylindrical, 4–6 annuli.E. Aecial peridium with smooth outer surface. F. Aecial peridium with densely warted inner surface. Scale bars: A = 20um; B and C = 10μm; D = 1μm; E = 10 μm; F = 20 μm.