113 



FIG. 11. Conidia of H. No. 1: a and b, 

 with outer wall cracked open by pres- 

 sure, the inner hyaline wall and the pro- 

 toplasts emerging; c, another conidium with 

 the outer wall crushed by pressure, the two 

 protoplasts walled and touching; d, similar 

 to c, but with the protoplasts separate; e, 

 immersion-lens view of two protoplasts 

 within a conidium, showing thickening at 

 their point of nearest approach to each 

 other; /, a longitudinal microtome-section 

 of a conidium from which both sides have 

 been cut away; g, a cross-section of a 

 conidium showing much clear space between 

 the protoplast and the outer wall. 



(Fig. 11). De Bary (9) remarks that the endosporium often shows great 

 softness and delicacy but is by no means always thinner than the other 

 wall. That the outer conidial wall has no internal ridges, and takes no 

 part in forming septa, is shown both by direct observation and by inference 

 from the way in which the conidial contents slide, unobstructed, length- 

 wise of, and out of, the outer conidial wall. Ravn (91) states that in the 

 three species studied by him the walls and septa are very thin, but when 

 treated with glycerine, etc., the outer wall becomes prominently thickened, 



