Phylum:Anamorphic fungi >> Class: Anamorphic fungi >>  Order: Anamorphic fungi 
   
 
 BCRC Number 32736      
   
 Scientific Name: Megacapitula villosa
 
   
   
 Author:

Megacapitula villosa Chen & Tzean, Mycol. Res. 97: 347-350. 1993.

   
 
 
 
 
 Description: Colony diameter on OMA larger than 90 mm in 70 d at 25°C, effuse, floccose, zonate, brownish grey, greyish brown to yellowish brown or olive brown (6C-E2-3, 5F5-6, 4F3-5); reverse brownish grey to yellowish brown or olive brown (6C-E2-3, 5F5-6, 4F3-5); mycelium partly superficial, partly immersed, composed of branched, septate, smooth, roughened, or verrucose, hyaline, pale brown, to dark brown or olive brown, 1.3-4.2 μm wide hyphae. Conidiophores micronematous, semimacronematous, mononematous, simple or branched, straight or flexuous, pale brown to brown, smooth, roughened or verrucose, 5.0-63.3 × 3.0-6.7 μm. Conidiogenous cells integrated, terminal, lateral or occasionally intercalary, determinate. Conidia holoblastic, solitary, ovoid, obclavate, ellipsoidal or obpyriform, muriform, 79.4-230.0 × 47.6-119.0 μm, brown to dark brown or black, smooth, often outer wall reticulate in young stage, capped when mature, with apical densely packed hairy appendages which are branched or unbranched, septate, smooth, up to 556.0 μm long, base brown or dark brown, thick-walled, 3.0-6.3 μm wide, tapering and paler toward the apex which is hyaline, 1.0-1.7 μm wide.
 
 
 
 
 
 Specimens:

isolated from fallen, decayed petiole of broadleaved trees, 31 Mar. 1991, holotype PPH17 (dried culture) & extype PPH17E (living culture) were deposited in Department of Plant Pathology and Entomology, National Taiwan University, Taipei, Tai-wan, R.O.C. PPH17E was also deposited in Culture Collection and Research Center (CCRC 32736), Hsinchu, Taiwan, R.O.C. Isotypes in NY and as IMI 353413.

 
 
 
 Habitat: from fallen, decayed petiole of broadleaved trees.
 
 
 
 Distribution:

Taiwan.

 
 
 
 References:

Chen, JL and Tzean, SS. 1993.

   
   
   
 Provided:

S. S. Tzean and J. L. Chen

 
 
 Note: Megacapitula villosa in some respects shows similarity to Piricauda cochinensis (Subram.) Ellis, Acrodictys appendiculata Ellis, Monodictys lepraria (Berk.) Ellis, Bioco-niosporium baccharidis Batista & Bezerra, Pseudopetrakia kambakkamensis (Subram.) Ellis, and Berk-leasmium concinnum (Berk.) Hughes. However, conidiogenous cells of P. cochinensis are monotretic, often clavate, short, cicatrized with a well-defined pore in the middle of each dark scar. These characteristics are never present in M. villosa. In addition, the conidia of P. cochinensis are much smaller and their appendages are fewer and shorter than in M. villosa. The distinction between them is noticeable. Though the conidia of M. lepraria, B. baccharidis and P. kambakkamensis are also muriform in common with M. vil-losa, the gross features of the former three species are markedly different from the latter, for instance, in the aspects of prominent apical protuberances, polar subulate spines, or short appendages, also the conidial sizes and shapes are much smaller (Ellis, 1976). Based on fructifications, clamp-connexions, sporodochia, conidiogenous cells, appendages and co-nidial morphology, M. villosa can resemble several genera.