Shimizuomyces paradoxus Kobayasi

Bulletin of the National Science Museum, Tokyo 7: 1. 1981.
Shimizuomyces, Clavicipitaceae, Hypocreales, Hypocreomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi
Type Specimen: 
Stored in TNS
Type Locality: 
Ueno-mura, Tano-gun, Gumma Pref. Japan.

Stromata soliray or several, clavate to cylindrical, simple, on seeds of Smilax sieboldi (Smilacaceae). Fertile area yellow, clavate to cylindrical, 10-35 x 1-2.5 cm. Stipe yellow or pale creamy, cylindrical, 10-40 x 0.5-1.2 cm. Stromata in dried specimens brown or dark brown.


Perithecia partly immersed, pyriform, 350-400 x 200-250 um.


Asci 8-spored, fusoid or cylindrical with attenuated tips, 100-150 x 5-8 um, possessing a prominent cap (4-5 um).


Ascospores acerose, multiseptate (3 to 8 septate), not fragmenting into partspores, 55-75 x 2-3 um.

Host or Substrate: 

On small red fruit of Smilax sieboldi

Specimens Examined: 

EFCC 5282, EFCC6279, EFCC 6564, EFCC 7149


Shimizuomyces paradoxus is known to be a pathogen of seeds of Smilax sieboldii. Its ecology is unigue among the members of plant-associated genera (e.g., Balansia, Claviceps, Shimizuomyces, and Ustilaginoidea) in Clavicipitaceae. While most of the species in these genera are parasites or endophytes of the members of plant family Poaceae, the host of S. paradoxus belongs to a distantly related family Smilacaceae, presenting a hypothesis of multiple origins of plant associations in Clavicipitaceae (Sung et al 2007). The ascospores obtained from dried aggregates on the surface of fertile area are deformed and some cells are inflated, especially in the middle portion of ascospores (See images in the section of Asci in this page).


Kobayasi, Y., 1981. Revision of the genus Cordyceps and its allies 2. Bulletin of the National Science Museum Tokyo, series B, 7, p.1-13.

Sung et al., 2007. Phylogenetic classification of Cordyceps and the clavicipitaceous fungi. Studies in Mycology, 57(1), p.5-59.

Page Author: 
Gi-Ho Sung