BOTRTTIS. 315 



*** Yellow ; tawny, or golden. 



Botrytis citrina. Berk. 



Forming thin patches 1 in. or more across, at first white, 

 then yellow ; hyphae erect, septate, main branches attenuate 

 or often in opposite pairs, hranchlets short, each hearing 

 a single pear-shaped yellow conidium at the tip, measuring 

 9-10 X 5 yn. 



Botrytis citrina, Berk., Ann. Nat. Hist., vol. i. n. 127, 

 t. viii. f. 12. 



On dead fallen branches of cherry. 



The hyphae when mature are bright yellow. 



Botrytis brevior. Sacc. 



Tufts minute, subglobose, rufous, hyphae sparingly 

 branched, septate, joints short ; conidia elliptical, granu- 

 lated, 5 X 7-8 IX. 



Botrytis hrevior, Sacc, Syll., n. 635. 



Coccotrichum brevius, B. & Br., Ann. Nat. Hist., n. 1918, 

 t. 3, f. 8. 



On bark. 



Tingeing water with a rufous shade. Subferruginous when 

 dry. 



**** Olay-colour or greenish. 



Botrytis argillacea. Cooke. 



Forming broadly effused, thin, greyish-brown patches; 

 fertile hyphae, erect, septate, main branches few, divided in 

 a forked manner at the apex ; tips of branchlets slightly 

 thickened, bearing small numbers of elliptical, almost colour- 

 less conidia, measuring 10-12 X 7 /x.. 



Botrytis argillacea, Cke., Grev., t. 48, f. 6 ; Sacc, Syll., iv. 

 m. 646. 



On wood. 



Forming clay-coloured patches 6 in. and more long. 



Botrytis virella. Fr. 



Forming an effused, powdery, very delicate greenish layer ; 



sterile hyphae creeping, about 3 /t thick, colourless, branded, 



septate; fertile hypbae erect, septate, coloured, 100-120 x 



3 fi, bearing near the apex 2-4 short, slightly inflated branch- 



