Duraxd : Classification of the Fleshy Pezizineae 483 



The sterile layers of this species resemble those of Cyathicula 

 coronata so closely that a separate description is not necessary. 

 Sections of the two plants could scarcely be distinguished but for 

 the teeth. Various other species of Phialea examined have an 

 essentially similar structure. 



Helotium citrinum (Hedw.) Fr. PL 30, Fig. 8 



This is one of the commonest of the Discomycetes growing 

 on rotton wood. The disc is a bright clear yellow. 



This plant, too, resembles Cyathicula and Phialea in all essen- 



H. fagineum, H. fructigeniim, H. 



and others. 



Helotium epiphyllum (Pers.) Fr. PL 31, Fig. 13 



The hypothecium and medullary portion of this plant are es- 

 sentially the same as those in plants previously described in this 

 family. The ectal layer of the excipulum, however, differs very 

 decidedly in being composed of small rounded cells 9-1 2 [i in diam- 

 eter. These cells are thin-walled and hyaline, and form a definite 

 pseudo-parenchymatous tissue. The layer fades out toward the 

 margin, and in this respect, also, differs from all the plants pre- 

 viously described. 



H. herbanim agrees in essential features with H. epiphyllum. 



Pitya cupressi (Batsch) Fuckel 



Rehm* says of this plant: " Excipulum prosenchymatous. 



" Hypothecium and excipulum 



Masseef on the other hand gives : 

 parenchymatous, cortical cells largest." My sections made from 

 N. A. F. no. 2322 show the following structure : The hypothe- 

 cium and medullary portion are prosenchymatous throughout. 

 The innermost part is made up of closely interwoven slender 

 hyphae occasionally septated. Toward the outside they become 

 more parallel. The cortex or ectal layer of the excipulum is very 

 different and is separated by an abrupt transition from the parts 

 within. It is distinctly pseudo-parenchymatous, composed of 

 rounded cells 9-1 5 ;i in diameter. The walls are thin and hyaline. 



* Rehm, p. 926. 



t Massee (3), 4 : 291. 



