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Durand : Classification of the Fleshy Pezizineae 487 



are thickened and dark brown. M. polygoni and M. atrata agree 

 with the species just described, except that the brown outer layer 

 of the excipulum is thicker and forms the margin of the cup. 



Tapesia fusca (Pers.) Fuckel. PL 32, Fig. 15 



In many respects this plant resembles Mollisia cinerea, but dif- 

 fers in being seated on a dark brown subiculum. 



The hypothecium is poorly developed. The excipulum con- 

 sists of two layers. The inner one is made up of small hyaline 

 hyphae closely interwoven. The outer layer is composed of 

 rounded or polygonal cells 9-12 p in diameter. At the surface 

 these cells have thick dark brown walls and are quite prominent, 

 while the inner ones are hyaline and thin-walled. 



The underlying subiculum consists of a layer of stout, loosely 

 interwoven, brown hyphae, extending for some distance beyond 

 the base of the cup on all sides. Many of these threads are con- 

 tinuous with the excipular cells at the base. T. culcitella (C. & E.) 

 Sacc. differs in having the brown excipulum a little less extensive. 



Pseudopeziza trifolii (Bernh.) Fuckel 



This plant is parasitic on the leaves of clover. The yellowish 

 cups are at first buried beneath the epidermis, but finally break 

 through, becoming sessile on the surface. 



The excipulum is a single layer of rounded, brown-walled cells,* 

 5-10// in diameter. At the base they are produced downward 

 between the cells of the host. Occasionally those at the sides of 

 the cup are prolonged from the surface in the form of very short 

 pili. The hypothecium is thin. 



Pvrenopeziza ebuli (Fr.) Sacc. 



This is a small, sessile, black plant growing on herbaceous 

 stems. It develops under the epidermis but finally breaks through, 



becoming cup-shaped. 



The excipulum consists of two layers. The thick outer one 

 is composed at the base of rounded or somewhat elongated cells, 

 5 fit in diameter, with brown walls. At the sides of the cup the 

 cells are larger and more uniformly rounded, 9-12// in diameter. 

 At the margin they become elongated and fibrous. 



