Puccinia caricis-pediformis 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 : 242-244

C11: Puccinia caricis-pediformis Jing X. Ji, Zhuang Li, Y. Li & Kakish. sp. nov. ( Fig. 14 )

MycoBank No: MB 838300.

Diagnosis: —This species is characterized by having only telial stage morphologically similar to P. caricis-amblyolepis , but phylogenetically separated.

Typus: — CHINA, Jilin Province, Changchun, Jingyue Forest Park, telia on Carex pediformis C.A. Mey. , 20 May 2016, M. Kakishima & J. X. Ji, HMJAU 8836 , Holotype.

Etymology: —Named after host plant on which telia are formed.

Description: — Spermogonia, aecia and uredinia not found. Telia hypophyllous, compact, blackish brown, rounded to broadly elliptic, erumpent. Teliospores broadly clavate, ellipsoid, truncate and rounded at apices, constricted at the septa, attenuate at the bases, 38.0–53.5 × 17.5–22.5 µm (av. 40.5 × 17.5 µm); walls brown, 0.8–1.0 µm (av. 0.9 µm) thick at sides, 7.5–12.0 µm (av. 9.5 µm) at apices; pedicels persistent, hyaline, 9.0–16.0 µm (av. 12.5 µm) long.

Additional specimens examined from northeastern CHINA: — Heilongjiang Province, Wuchang , telia on Carex pediformis , 6 June 2016, HMJAU 8835 .

Hosts and distribution in northeastern CHINA ( Fig. 1 ): —Telia on Carex pediformis (A, D).

Note: —Two specimens on C. pediformis are phylogenetically close to P. caricis-amblyolepis and P. caricistenuiformis , but are clearly separated from these species because they have a distinct linage ( Fig. 3 ) and are, therefore, treated as an independent species. Teliospores are morphologically similar to P. caricis-amblyolepis , but no uredinial stage has been found; spermogonial and aecial stages are suspected to be produced on Urtica .

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 3. Phylogenetic tree of specimens on Cyperaceae and related host plants constructed by MP method based on ITS+28S regions of rDNA. Bootstrap values of MP and ML are followed by the Bayesian posterior probabilities (Bpp) on the nodes in the topology.Asterisk (*) represents bootstrap values or Bpp less than 50% in the topology. Sample data are shown with voucher specimen number or GenBank accession number, and host plant. Sequence data determined in this study are shown in color. Teliospore shapes are shown in each clade detected, and new species are shown by asterisk (*) on clades. 0, I: Spermogonial and aecial host genus. Asterisk (*) on host plants: Spermogonial and aecial host plants.

FIGURE 14. Puccinia caricis-pediformis on Carex pediformis. A, B. Telia on the lower leaf surface. C. Vertical section of a telium. Scale bars: C = 20 μm.