Cordyceps nutans Pat., Bull. Soc. Mycol. France 3: 127. 1887.
Cordyceps bicephala subsp. nutans (Pat.) Moureau, Mém. Inst. Roy. Colon. Belge 7: 47. 1949.
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 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 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 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.
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.
attacking adult stink bug (Pentatomidae, Heteroptera)
NHJ806.02, NHJ853.12, NHJ1305
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.
Petch, T. 1939. Notes on Entomogenous Fungi. Transcations of the British Mycological Society, 23:127-148
Kobayasi, Y. 1941. The genus Cordyceps and its allies. Science reports of the Tokyo Bunrika Daigaku. 84:53-260
Nigel Hywel-jones, 1995. Notes on Cordyceps nutans and its anamorph, a pathogen of hemipteran bugs in Thailand. Mycologyical Research, 99(6):724-726
Sung et al., 2007. Phylogenetic classification of Cordyceps and the clavicipitaceous fungi. Studies in Mycology, 57(1):5-59
Sasaki, F. et al, 2004. Isolation of vegetable wasps and plant worms, Cordyceps nutans, from fruit-body tissue