CHROMOGENIC FUNGI WHICH DISCOLOR WOOD. 103 



from 5,u to 10,u. The latter form are of the nature of 

 chlaniydospores, having thick walls, and from one to two 

 cells. These sometimes germinate, and apparently may 

 function as resting spores. 



CONIDIA. 



Two forms of conidia are borne on the mycelium, one of 

 these being the hyaline form (pi. 11, f. 5), which buds 

 both -from the cells of the mycelium and from other conidia 

 during the earlier growth of the colony. These are deeply 

 imbedded in mucilage, and germinate readily, if not too 

 old, in agar plate cultures. They are ephemeral, losing 

 their power of germination in a few weeks. They are 

 elliptical in shape, and measure 8// to 12,* by 3/* to 5/x, 

 and are rarely septate. Among the hyaline conidia, as the 

 colony grows older, brown forms of the same shape soon 

 occur (pi. 11, f. 6), and finally become very abundant. 1 

 These are thick walled, and do not appear to germinate as 

 readily as the hyaline type. They probably function as 

 resting spores. They are sometimes septate, but more often 

 have one cell. They measure 10/.* to 14//., by 5 a to 6//. 

 Another form of conidia of the true type of Hormiscinm 

 (pi. 11, f. 7) is found borne from the filaments in the 

 older portions of the extremities of the colony, and on the 

 filaments in cultures upon wood. These are globose in 

 form, of a dark olive color, not rugose, and are borne from 

 short hyphae in chains of two to several. They measure 

 from 7/i to 12// in diameter. These chains hold together 

 tenaciously, and do not break apart like those of related 

 genera. 



4. Other Wood-blackening Fungi. 



A number of other fungi were noted, which add to the 

 stains which occur superficially on lumber, especially on the 

 sapwood. Several of these were identified, which ap- 

 parently discolor the wood only by the color present either 



