Phragmidium potentillae (Pers.) P. Karst., Bidrag till Kaennedom av Finlands Naturoch Folk, 31: 49, 1879

Sun, Jing-E, Zhang, Qian, Luo, Wen-Mei, Yang, Yuan-Qiao, An, Hua-Ming & Wang, Yong, 2022, Four new Phragmidium (Phragmidiaceae, Pucciniomycetes) species from Rosaceae plants in Guizhou Province of China, MycoKeys 93, pp. 193-213 : 193

Phragmidium potentillae (Pers.) P. Karst., Bidrag till Kaennedom av Finlands Naturoch Folk, 31: 49, 1879

Fig. 8

Description.

Spermogonia and aecia not observed. Uredinia produced on the abaxial leaf surface, hypophyllous, nearly oval, powdery, densely bright orange, nearly oval, surrounding by host epidermis, 0.8-1.5 × 0.4-0.7 mm, and densely bright orange. Urediniospores angular to squarish, oval to nearly globose, produced in basipetal succession, 17-26 × 14-22 µm (mean 21.5 × 18 μm, n = 30), or bright-yellow to orange, immature urediniospores are colorless; thick-walled, wall 0.6-1.3 µm thick, colorless, densely and minutely echinulate. Telia and teliospores see Liu et al (2018).

Habitat.

Potentilla kleiniana

Known distribution.

China: Guizhou Province, Qinghai Province, Sinkiang Province; USA, the United Kingdom, Australia, Tasmania and Japan.

Material examined.

China. Guizhou Province: Guiyang city, 27°09'26"N, 106°98'90"W, 730 m, 22 Jun 2021, on Potentilla kleiniana , coll. J.E. Sun, HGUP21034 .

Notes.

In the phylogenetic tree, HGUP21034 clustered with two sequences of specimens of Phragmidium potentillae (Fig. 1 ). The uredinia of P. potentillae described by Liu et al (2018), as 0.2-0.8 mm diam, smaller than in the specimen examined, 0.8-1.5 × 0.4-0.7 mm, the urediniospores mostly globose and echinulate, (18-25 × 15-21 μm vs. 17-26 × 14-22 µm).

Figures

Figure 1. The maximum parsimony tree of 42 Phragmidium taxa based on ITS and LS U genes; host plants are also given.

Figure 8. Phragmidium potentillae (HGUP 21034) on Potentilla kleiniana a-c uredinia on leaves d longitudinal section of uredinium e-j urediniospores. Scale bars: 1 mm (c); 50 µm (d); 12.5 µm (e-j).