Carduus bourgeanus, from González Fragoso (1924a): teliospores and two urediniospores

Carduus pycnocephalus: teliospore and an aberrant urediniospore

gall

no host plant alternation, only uredinia and telia. Uredinia dispersed, chestnut brown, pulverulent; urediniospores with 3-4 equatorial pores, each capped by a papilla. Telia also on the stem, dark brown, soon naked. Teliospores two-celled, elliptic, finely echinulate, c. 37 µm long. Pedicel hyaline, deciduous, up to 60 µm.

uredinia, telia

Asteraceae, narrowly monophagous

Carduus bourgeanus, pycnocephalus, tenuiflorus.

By Gäumann, and possibly on his authority also by Klenke & Scholler, “C. pycnocehalus” is interpreted as C. acanthoides; however, that is a different species.

synonyms

many authors, including Termorshuizen & Swertz, and also the Index Fungorum (2016), consider this species conspecific with P. calcitrapae.

references

Brandenburger (1985a), Gäumnn (1959a), González Fragoso (1924a), Klenke & Scholler (2015a), Kruse (2019a), Losa España (1944a), Termorshuizen & Swertz (2011a), Unamuno (1942a).