Ophiocordyceps nutans (Pat.) G.H. Sung, J.M. Sung, Hywel-Jones & Spatafora

Taxonomy
Authority: 
(Pat.) G.H. Sung, J.M. Sung, Hywel-Jones & Spatafora
Citation: 
Studies in Mycology 57: 45.
Classification: 
Ophiocordyceps, Ophiocordycipitaceae, Hypocreales, Hypocreomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi
Common Names: 
Cordyceps nutans
Morphology
Stroma: 

Stromata usually simple, stipitate with one to several fruit bodies arising between the head and thorax or mouth of infected adult stink bugs (Pentatomidae, Heteroptera). Stipe black or blackish brown, long straight or curved, 50-90 x 0.4-0.8 mm. Fertile head or clava red, orange or orange-yellow, narrowly cylindrical, oviod or fusoid, 6-17 x 3-5mm.

 
Perithecia: 

Perithecia  immersed, with ostioles, hyaline-walled, oblique with a curved neck. Narrowly oviod to conoid, light yellow to brownish yellow, 550-800 x 130-200 um.

 
Asci: 

Asci cylindrical, up to 780 x 7-8 um, 8-spored; ascus cap pronounced, 5.0-7.1 um in height, hemispherical with median pore.

 
Ascospores: 

Ascospores filiform, hyaline, multiseptate, easily breaking into part-spores. Partspores cylindrical or slightly barrel-shaped, ends blunt, 9.3-15.0 x 1.5-2.0 um.

Anamorph
Genus: 
Hymenostilbe
Species: 
nutans
Authority: 
Samson & H.C. Evans
Notes: 

Conidiogenous cells crowded along the pigmented apical region, 10.6-14.3 x 3.3-4.6 um, red to deep salmon pink. Conidia 4.3-7 x 2.7-3.3 um, red to deep salmon pink.

Ecology
Host or Substrate: 

attacking adult stink bug (Pentatomidae, Heteroptera)

Known Distribution: 
Belgium, Brazil, China, Colombia, Costa Rica, Ecuador, Ghana, Guyana, Indonesia, Japan, Korea, Madagascar, Malaysia, Panama, Papua New Guinea, Peru, Philippines, Taiwan, Thailand, Vietnam
Notes
Specimens Examined: 

NHJ806.02, NHJ853.12, NHJ1305

Commentary: 

Nutans refers to the appearance of clava region of the stroma to bend downwards or droop, however in many specimens the clave may be erect. The discharged ascospores, conidia or endosclerotial tissue of Ophiocordyceps nutans grow very slowly in culture. Samson and Evans (1975) described the morphological features of Hymenostilbe nutans but were unable to isolate it from the conidia; Sung et al (1993) only isolated Ophiocordyceps nutans from ascospores not from endosclerotial tissue on PDA medium. Sasaki et al (2004) isolated Ophiocordyceps nutans from discharged ascospores and the stipe and endosclerotial tissues of fruit bodies using a surface sterilization method.

References
Page Author: 
Mingjun Chen, Gi-Ho Sung