Abstract
Tar spots have been observed on
Figures & Tables
Fig. 1. Tar spots of infected with a sp. A, tar spots on an adaxial leaf surface and a herbaceous stem in May 2019; B, ascostromata developing on the amphigenous surface of living leaves, surrounded by a yellow halo; C, ascostroma on the abaxial leaf surface, exposing a yellow (arrow head); D, vertical section of ascomata; E, hymenial layer of an ascoma; F, asci with ascospores; G-I, ascospores. abs, abaxial leaf surface; ol, outer layer of stroma; uw, upper wall of ascoma; hy, hymenium; as, ascus; pa, paraphysis.