GENERA AND SPECIES. 83 



2. Calicium. 

 This genus is represented by a considerable number 

 of species, which are uniformly insignificant plants, 

 having no special interest for the amateur. In form 

 they resemble Coniocybe. The stipes and apothecia 

 are black, in other respects like those of Coniocybe, 

 They occur upon tree trunks in shaded places, upon 

 fences and decaying wood. The algae are Protococus 

 viridis ; they occur singly, and are of a bright-green 

 color. In some species the thallus is very deficient, 

 or even wholly wanting, particularly in older speci- 

 mens. Some species are included among fungi 

 (Mucor) by various authors. 



Tiie spores are two-celled and dark. 



1. Calicium Curtisii. Tliallus wanting, or very 

 rudimentary. Stipes dark, slender, bearing a single, 

 dark, globose apothecium. Spores brown, two-celled, 

 oblong, with pointed ends, 14/x X 5/x. 



Occurs on tree-trunks, especially species of Hhus. 



2. Calicium fuscipes. Thallus rarely recognizable. 

 Stipes rather long and slender, dark-brown. Apo- 

 thecia spherical, dark-brown ; in fully matured plants 

 the entire thecium may fall away. Spores dark-brown, 

 elliptical, simple, 12/x X 5.5/x. 



3. Calicium lenticulare. Thallus indistinct, color- 

 less or whitish. Stipes rather short and thick. Apo- 

 thecia comparatively large and somewhat flattened. 

 Spores small, dark-brown, elliptical, simple, 6.0/x X 4^. 



4. Calicium hyperellum. Thallus only slightly de- 

 veloped, greenish-yellow, unevenly spreading. Stipes 

 long, slender, dark-brown. Apothecia usually spheri- 



