THE FORMATION OF HYPHAL FUSIONS 5 



a mesh ; and such a structural condition is attained by the formation 

 of a certain number of hyphal fusions, but not too many. The actual 



K.IU. 1. — Pleurage curvicolla. Photomicrograph of a mycelium produced from 

 spores sown in a hanging drop of cleared dung-agar on the previous day. To 

 show bridging hyphae, formed by peg-to-peg fusions, connecting the ordinary 

 hyphae into a network. The number of hyphal fusions in the field of the 

 photograph has about reached its maximum. The scalariform structure 

 formed when two parallel hyphae become united at intervals along their 

 length by several bridging hyphae is well shown on the left. Magnification, 

 600. 



formation of hyphal fusions seems to alter the physiological condition 

 of a mycelium in such a way that the mycelium in the end ceases to 

 produce hyphal fusions. 



