7^ RESEARCHES ON FUNGI 



cylindrical above, about 2 5 mm. thick in the centre, slightly 

 thicker below, hollow, white, smooth below and slightly fibrillose 

 just below the pileus. The spores were rich yellow when seen in 

 water with the microscope, and formed a chocolate-coloured 

 deposit on white paper. Their dimensions were 13-14 by 7-5 fi 

 and in shape they were oval-fusiform (Fig. 37, G, d). The above 

 description was made from the larger of the two fruit-bodies. The 

 smaller fruit-body was only about one-half the size of the larger. I 

 was unable to identify the species, but two mycological friends have 

 suggested that it was Bolbitius titubans ; but, as I feel uncertain 

 about this identification, I prefer to call it Bolbitius species B. 



The general structure of the hymenium of Bolbitius species B 

 was found to be identical with that of Bolbitius flavidus. The para- 

 physes were again relatively large and united into a definite system, 

 while the basidia were monomorphic and swollen at their ends just 

 as before (Fig. 37, G, c). The organisation of the whole fruit-body 

 was so similar to that of the Bolbitius which has just been described 

 that it will not be necessary to give an account of it in detail. It 

 seems to me highly probable, therefore, that all the other species 

 of Bolbitius will be found to be organised like Bolbitius flavidus 

 and thus come to be included in the Bolbitius Sub-type. 



At T> and E in Fig. 37 are shown two vertical sections of the 

 pileus of Bolbitius species B, D having been made from the speci- 

 men A, and E from the specimen B. In both, at g, there is a 

 well-marked transparent gelatinous pellicle. This pellicle, which 

 resembles that of B. flavidus, appears to have been produced by the 

 swelling of the outer walls of the palisade layer of the pileus -flesh. 



The cheilocystidia of Bolbitius species B differ from those of B. 

 flavidus, and at the same time closely resemble those of Galera 

 tenera, in that their necks are very thin instead of being stout and 

 in that each neck, instead of being naked, is crowned apically by a 

 rounded swelhng or head-piece (Fig. 37, G). 



A Comparison of the Fruit-body Mechanism of Bolbitius and 

 Coprinus. — A comparison of the fruit-body mechanism of Bolbitius 

 and Coprinus was made by the writer ^ in 1913 with a view 



^ A. H. R. Buller, " The Fruit-body Mechanism of Bolbitius," Transactions of the 

 British Mycological Society, 1913, pp. 235-238. 



