37i 
Mutinies caninus ( Huds .), Fr. 
course of the investigation, and for the use of papers which 
would otherwise have been inaccessible to me. My thanks are 
also due to Mr. H. M. Richards and to Mr. H. L. Jones, 
Assistants in the Botanical Laboratories, for numerous favours 
which have facilitated my work, 
EXPLANATION OF FIGURES IN PLATES 
XVII AND XVIII. 
Illustrating Dr. Burt’s paper on the development of Mutinus caninus 
(Huds.), Fr. 
Note . — All figures were drawn with an Abbe camera-lucida. 
Lettering common to all the figures. 
M, medullary bundle of young stages ; A 7 , sheaf-like head of M\ C, cortical 
layer; G , gelatinous layer of the volva ; Gl., gleba; AT, hymenium ; Z, outer and 
more open portion of A 7 ; 0 , dense portion of N; R, central column ; S, stipe; 
c, tissue of chambers and pits ; i, region of innermost layer of volva ; h, partition- 
wall of pseudoparenchyma; m, point at which sheaf-like head N arises from 
medullary bundle M. 
Figs. 1-4. Median longitudinal sections through eggs in successive young 
stages, showing the course of differentiation of the several parts from the sheaf-like 
head N. At m , Fig. 2, the medullary bundle M has direct lateral connexion with 
the lower part of the region in which the gelatinous layer of volva, innermost 
layer of volva, and the gleba arise later. Figs. 1 and 2 are magnified 106, Figs. 
3 and 4, 66. 
Fig. 5. Median longitudinal section through an egg in an early intermediate 
stage. Differentiation of 0 has given rise to the central column R, the intermediate 
tissue A , and the zone i. The rudiment of the stipe S is differentiating in one side 
of A , and that of the hymenium ZZat the other side x 36. 
Fig. 6. Cluster of young basidia from the point ZT, Fig. 5. X670. 
Fig. 7. Rudiment of the stipe at its base, with adjacent tissues. From Fig. 5 
at A. X325. 
Fig. 8. An older stage than Fig. 6 with the outer portions omitted. On account 
of a curvature of the stipe, the lower part of the figure — the part below S — had to 
be drawn from another section in the same series. The crowding in of basidia into 
the hymenial surface has thrown the latter into folds ; separation of the gleba from 
the intermediate tissue A is now almost completed, x 36. 
Fig. 9. Portion of the rudiment of the stipe S of Fig. 6 more highly magnified. 
x 3 2 5- 
