Puccinia caricis-atractylodes Jing X. Ji, Zhuang Li, Y. Li & Kakish., 2022

Ji, Jingxin, Li, Zhuang, Li, Yu & Kakishima, Makoto, 2022, Phylogenetic approach for identification and life cycles of Puccinia (Pucciniaceae) species on Carex (Cyperaceae) from northeastern China, Phytotaxa 542 (3), pp. 221-255 : 236-237

C5: Puccinia caricis-atractylodes Jing X. Ji, Zhuang Li, Y. Li & Kakish. sp. nov. ( Fig. 8 )

MycoBank No: MB 838297.

Diagnosis:— This species is characterized by the small size of teliospores with short pedicels which is distinguished from P. aomoriensis Syd. & P. Syd. host-alternating between Carex and Atractylodes .

Typus: — CHINA, Jilin Province, Jilin City, Jiaohe , telia on Carex lanceolata Boott , 11 September 2017, M. Kakishima & J. X. Ji, HMJAU 8888 , Holotype . CHINA, Jilin Province, Jilin City, Jiaohe , spermogonia and aecia on Atractylodes macrocephala Koidz. , 1 July 2018, M. Kakishima & J. X. Ji, HMJAU 8890 , Epitype .

Etymology: —Named after the host plant genera of the different stages.

Description: — Spermogonia amphigenous, surrounded by greenish-yellow lesions, densely grouped, honeyyellow, subepidermal, flask-shaped, type 4 of Cummins & Hiratsuka (2003). Aecia is mostly hypophyllous, cupulate with peridia, Aecidium - type. Peridial cells firmly conjunct, cubic to polygonal, hyaline. Aeciospores catenulate, globose to subglobose, angular, 12.0–17.0 × 9.0–12.0 µm (av. 14.0 × 10.5 µm); walls hyaline, 0.4–0.8 µm (av. 0.6 µm) thick, densely verrucose with big granules. Immature uredinia rarely found. Telia hypophyllous, blackish brown, rounded to broadly elliptic, erumpent. Teliospores broadly clavate, ellipsoid, truncate, rounded or conical at apices, middle or weakly constricted at the septa, rounded or attenuate at the bases, 34.0–51.0 × 17.5–23.5 µm (av. 43.5 × 19.5 µm); walls pale brown, 0.5–1.9 µm (av. 0.8 µm) thick at sides, 8.7–14.5 µm (av. 12.5 µm) at apices; pedicels persistent, hyaline, 22.0–37.0 µm (av. 29.5 µm) long.

Additional specimens examined from northeastern CHINA: — Jilin Province, Jilin, spermogonia and aecia on Atractylodes macrocephala , 16 June 2019, HMJAU 8887 , 8896 . Jilin Province, Tumen , spermogonia and aecia on A. macrocephala , 28 June 2016, HMJAU 8329 . Jilin Province, Jilin, telia on Carex lanceolata , 11 September 2017, HMJAU 8889 . Jilin Province, Jilin, telia on Carex sp. , 3 September 2018, HMJAU 8913 .

Hosts and distribution in northeastern CHINA ( Fig. 1 ):—Spermogonia and aecia on Atractylodes macrocephala (Asteraceae) (B, F). Telia on Carex lanceolata (B); Carex sp. (B).

Note:— Only one species, P. aomoriensis , has been reported from China, Japan, Russian Far East and Korea as a species host-alternating between Atractylodes and Carex ( Ito 1950, Hiratsuka 1960, Harada 1984, Hiratsuka et al. 1992, Zhuang et al. 1998, Azbukina 2005, 2015). However, teliospore size of P. caricis -atractylodes (34.0–51.0 × 17.5–23.5 µm) are smaller (35–58 × 17–27 µm), and teliospores pedicels are shorter than those of P. aomoriensis .

Figures

FIGURE 1. Collection areas in northeastern China. A. Changchun area in Jilin Province. B. Jilin area in Jilin Province. C. Mountanious area in southern Heilongjiang Province. D. Area around Changbai Mountains in Jilin Province. E. Baicheng area in western Jilin Province. F. Yanbian area in eastern Jilin Province. G. Tonghua area in southeastern Jilin Province.

FIGURE 8. Puccinia caricis-atractylodis on Atractylodes macrocephala (A–E, H, I) and Carex lanceolata (F, G, J). A. Plants producing spermogonia and aecia on the leaf surface in the field. B. Aecia on the lower leaf surface. C. Vertical section of a spermogonium. D. Vertical section of an aecium surrounded with peridia. E. Aeciospores. F. Plants producing telia on the leaf surface in the field. G. Telia on the lower leaf surface. H. An aecium observed under SEM. I. Aeciospores with granules on the surface observed under SEM. J. Vertical section of a telium. Scale bars: C, E = 20 μm, D = 50 μm, H = 100 μm, I = 5 μm, J = 30 μm.