BOTKYOTINIA 61 



4. BOTRYOTINIA Whctzel, Mycologia 37: 678. 1945. 



Stroma consisting of a black, flattened, or irregularly hemi- 

 spherical sclerotium, usually formed just beneath the cuticle 

 of the epidermis, finally erumpent, remaining firmly attached to 

 the host; spermatia globose, borne on branching spermatio- 

 phores, enveloped in a mucilaginous matrix; conidial stage a 

 Botrytis; conidia on short sterigmata in dense clusters, smooth, 

 subglobose to pyriform. 



Apothecia cupulate, stalked, some shade of brown, infundib- 

 uliform to discoid, or margin reflexed; asci cylindric, or subcy- 

 lindric; spores hyaline, simple, ellipsoid. 



Type species, Sderotinia convoluta Drayton. 



On garden Iris. 1. B. convoluta. 



On Ricinus. 2. B. Ricini. 



In stems of Gladiolus. 3. B. Draytoru. 



On Narcissus. 4. B. narcissicola. 



1. Botryotinia convoluta (Drayton) Whetzel, Mycologia 37: 679. 

 1945. 



Botrytis convoluta Whetzel & Dra>ton, Mycologia 24: 475. 1932. 

 Sderotinia convoluta Drayton, Mycologia 29: 314. 1937. 



Sclerotia shining-black, convolute, agglomerated, reaching 

 a size of 16 X 18 mm., frequently hollow in the center; conidio- 

 phores brown, erect, fasciculate, branched at the apex, about 1 

 mm. tall and 9-12 jx thick at the base, tapering toward the apex; 

 conidia light-brown, simple, smooth, ovoid to slightly pyriform, 

 borne in dense clusters on sterigmata produced from the ultimate 

 branchlets of the conidiophores, averaging 9 X 11 m; micro- 

 conidia present, 4-4.5 ji in diameter. 



Apothecia densely gregarious, arising from the sclerotial 

 agglomerations, infundibuliform to cyathiform, becoming discoid, 

 reaching a diameter of 2.5 4 mm., stipitate; stems reaching a 

 length of 3-6 mm. ; asci cylindric, reaching a length of 150-195 fx 

 and a diameter of 9 13 m, 8-spored; spores 1-seriate, ellipsoid, 

 hyaline, simple, at maturity with several oil-drops, averaging 

 7 X 15 ^; paraphyses abundant, filiform, hyaline, 2.5-3 n, slightly 

 enlarged above. 



On garden Iris. 



Type locality: Central Experimental Farm, Ottawa, 

 Canada. 



