British Gastromycetes . 9 1 
apex, which is expanded into a bright red disc furnished at 
the margin with from 5-8 bifid rays. Sacc., Syll. vii, p. 25. 
An Australian species, that has occurred at Kew in soil 
brought from Australia.] 
Genera Excluded. 
Polyangium , which is of insect origin. 
Cenococcum , is probably a degraded genus more allied to the 
Tuber ace ae . 
EXPLANATION OF THE FIGURES IN 
PLATES I, II, III, and IV. 
Illustrating Mr. George Massee’s Monograph on the British Gastromycetes. 
PLATE I. 
Figs. 1 -1 e. Hymenogaster tener, Berk, i, plants, nat. size; i a, section, nat. 
size ; a, peridium ; b> the white lines are the tramal plates from which the hymenial 
elements originate and project into the cavities c; d, sterile basal stratum; i b, 
spores in various stages of development ( x 400) ; 1 f young basidium bifurcating 
at the apex to form the two spores ( x 400) ; 1 c, 1 d, 1 e, examples of basidia with 
spores in various stages of development at 1 e, nearly mature ( x 400). (Drawn 
from type specimens in Herb. Berk., Kew.) 
Figs. 2-2 c. Octaviania asterosperma , Vitt. 2, plant, nat. size ; 2 a , section 
showing portion of gleba, slightly x ; a, peridium ; b, trama ; c, hymenial 
cavities ; 2 b, spores ( x 400) ; 2 c, portion of hymenium with basidia and para- 
physes ( x 200). 
Fig. 3. Octaviania Stephensii , Tul. Spores ( x 400). 
Figs. 4-4 b. Hysterangium nephriticum , Berk. 4, plants, nat. size, showing 
the dense white felted mycelium ; 4 a , section, nat. size ; 4 b, spores ( x 400). 
(Drawn from type specimens in Herb. Berk.) 
Figs. 5-5 b. Melanogaster ambiguus , Tul. 5, plant, nat. size ; 5 a , section of 
portion of gleba, slightly x ; 5 b, spores (x 400). 
Figs. 6, 6 a. Hydnangium carotaecolor, Berk. 6, plant, nat. size ; 6 a, two 
basidia, one bisporous, the other tetrasporous ( x 400). (Drawn from type speci- 
mens in Herb. Berk.) 
Figs. 7, 7 a. Rhizopogon rubescens , Tul. 7, plant, nat. size ; 7 a, spores 
( x 400). 
8-8 b. Hymenogaster citrinus , Vitt. 8, plant, nat. size ; 8 a , immature apex of 
a basidium bearing two spores still surrounded by the hyaline sac ( x 400) ; 8 b, 
mature spores ( x 400). 
