33 
the genus Calostoma , Desv. 
‘ This genus externally resembles Mitremyces , but not only is 
the covering of the peridium viscoso-cartilaginous, and 
reflected in the form of a veil, instead of falling off like a 
calyptra, but the capillitium exactly fills the cavity, the 
outer portion consisting of a barren stratum of coloured 
flocci, and the spores instead of being elliptic are globose 
and coarsely echinulate. The inner peridium is clearly 
represented by the barren flocci which form a dense lining to 
the cavity.’ Both plants are figured on the plate quoted, 
one being immature with the exoperidium continuous, the 
other having the exoperidium ruptured and persistent on 
the stem at some distance below its apex, and the spore-sac 
has disappeared from the endoperidium. The immature 
specimen has been cut open, and shows the spore-sac filling 
the endoperidium. 
In 1868 several more specimens of the same species were 
sent to Berkeley from Ceylon, one having the spore-sac 
extended and remaining attached to the mouth of the endo- 
peridium (Fig. 38 a) ; two others show the spore-sac contracted 
as in Calostoma . In some specimens the stem is cylindrical, 
in others ventricose and slightly lacunose. The exoperidium 
has in every instance disappeared from the stem. 
The genus Husseia was established before the globose- 
spored forms of Calostoma were known ; but as there are 
now four described species of these, one of the three points 
of distinction between Husseia and Calostoma (. Mitremyces ) 
disappears ; and a second relating to the spore-sac filling the 
cavity of the endoperidium, being only true of the immature 
condition, also is invalid ; whilst the third point of difference 
supposed to be afforded by the texture and mode of rupture 
of the exoperidium has its homologue in Calostoma cinna- 
bar inum. 
The structure of Husseia agrees in every essential point 
with that of Calostoma. The presence of the ruptured exo- 
peridium attached half-way down the stem is due to increase 
in length of the tissue between the endoperidium and exo- 
peridium during and after the rupture of the latter. Numerous 
D 
