CHROMOGENIC FUNGI WHICH DISCOLOR WOOD. 75 



C. minor is assigned, with the following cultural charac- 

 ters : — 



Mycelium. 



Cultures of eitner conidia or ascospores on pine agar 

 media germinated in a few hours, and in two days the col- 

 onies began to form conidia. The mycelium is white and 

 sparse. The hyaline filaments of the conidial stage measure 

 in width 1.5//, to 2.6//,, averaging 2.3/*. The brown or black 

 filaments in agar cultures and in wood measure in diameter 

 from 2/* to 4/*, averaging 3.5//,. These are often rugose, 

 the roughenings being coarser than those in C. exigua. 

 In some portions of the mycelium on wood there are 

 filaments that contain cells that are unequal in diameter, 

 being enlarged at one end. Like O. pilifera this species 

 follows chiefly the medullary rays of pine wood. 



Conidia. 



The formation of the conidia and the form of fruiting 

 do not differ essentially from those of C. pilifera and 

 C. exigua. The unicellular, hyaline conidia measure from 

 4//, to 5.5//, in length, and from 1.8//, to 2//, in width, aver- 

 aging 4.5ft by 2fx. They are oval to elliptical in shape, and 

 fall off at the slightest touch, collecting in rounded masses 

 on the hyphae when in moist air. 



Perithecia. 



The perithecia mature in about three weeks in artificial 

 cultures. They are spherical, black rugose bodies, vary- 

 ing from 40//, to 70//, in diameter, averaging 52//,, with a 

 beaked ostiolum 120//, to 160//, in length, averaging 135/*, 

 and from 6//, to 12//, in diameter (pi. 5, f. 6). The beak 

 ends in a whorl of short, thick bristles (pi. 3, f. 4). The 

 asci are round to oval, hyaline, with eight spores in each, 

 usually arranged in fours (pi. 5, f. 7). The spores meas- 

 ure 3.1/* to 4.2//, in length and .9//, to 1.9/* in width, averag- 



