192 RESEARCHES ON FUNGI 



as in the unbranched Clavariae, the lower more stalk-like part of 

 each club and the club apex are barren, the hymenium covering 

 only that part of the club which lies between these two regions. 

 The fruit-bodies, when growing out from the side of a stump, do 

 not turn upwards very readily and, doubtless, are not strongly 

 negatively geotropic. Whether or not the upper sides of more or 

 less horizontal clubs produce basidia and basidiospores remains 

 to be investigated. A spore of Calocera cornea, as recorded in 

 Chapter I, was found to develop from a just visible tiny rudiment 

 to full size in 40 minutes and to be discharged at the end of another 

 40 minutes, discharge being preceded by a drop-excretion at the 

 spore-hilum (Fig. 2, p. 7). A sterigma which has produced a 

 spore collapses a few minutes after the spore has been discharged, 

 and never produces a second spore. 



The horizontal distance of spore-discharge in Calocera cornea 

 was found by laying a fruit-body, which had been revived after 

 drying, in a closed compressor cell, waiting until a spore-deposit 

 had accumulated, and then measuring with the microscope the 

 horizontal distance from the sides of the fruit-body to which the 

 spore-deposit extended. This distance was found to be 0-2 mm. 

 although most of the spores were found to have settled about 

 1 mm. from the fruit-body. From this observation we can 

 conclude that the violence, of spore-discharge in Calocera cornea 

 is not nearly so great as in other Tremellineae such as Hirneola 

 auricula- judae, Auricularia mesenterica, Exidia albida, and Dacryo- 

 myces deliquescens, but is about equal to that of Clavaria formosa. 

 For comparative data upon the violence of spore-discharge the 

 reader is referred to the Table on p. 169. 



Calocera viscosa has a bright orange-yellow fruit-body which 

 forks once or twice upwards. The terminal branches of a fruit- 

 body are very erect, but are rather cylindrical than clavate and 

 taper to a point. I found by studying the position of spore-deposits 

 yielded by mature fruit-bodies in still air in small closed chambers 

 that, just as in certain branched Clavariae, the hymenium does 

 not cover the whole surface of each fruit-body but is lacking in the 

 lower portions of the fruit-bodies, at the apices of the terminal 

 branches, and on the upper side of each fork. 



