Durand : Classification of the Fleshy Pezizineae 475 



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♦ A second type of structure is illustrated by O. auricula, 

 and O. micropns, and consists of the excipulum being entirely 

 parenchymatous, the cells very large and irregularly polygonal 



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Finally, 0. onotica exhibits a type of structure exactly 

 intermediate between the two previously described. The hypothe- 

 cium and the broad cortical layer are truly parenchymatous, whilst 

 a central zone consists of densely interwoven hyaline hyphae." 



The only O tide a which I have examined is 0. leporina and my 

 observations differ only slightly from those of Massee. In my 

 specimens the hypothecium and bulk of the excipulum are com- 

 posed of coarse, closely interwoven, hyaline hyphae. These be- 

 come abruptly converted into a truly pseudo-parenchymatous 

 cortical layer composed of polygonal cells 25—40// in diameter. 

 These show little traces of their hyphal origin. Occasionally 

 little groups of these cells project slightly from the surface, giving 

 it a granular or furfuraceous appearance. 



Peziza badia Pers. 



The genus Peziza includes the large cup-shaped, fleshy Dis- 

 comycetes which are smooth and sessile. The structure of the 

 sterile layers presents considerable variations in different species 

 and we have all gradations from the coarse interwoven hyphae 

 exhibiting various degrees of septation and coalescence to the 

 pseudo-parenchyma of large vesiculose cells in some species o. 1 

 mm. in diameter. 



A typical structure is seen in Peziza badia Pers. The hypothe- 

 cium in this plant is very thin, and composed of very small and 

 dense pseudo-parenchyma. The excipulum exhibits three well- 

 marked layers. The ental one is entirely pseudo-parenchymatous, 

 and is composed of large, rounded, thin-walled cells 50-75// in 

 diameter. Intermingled with these are numerous smaller ones. 

 The middle layer joins the ental one with an abrupt transition. 

 Its thickness is about equal to that of the ental and ectal layers 

 combined, and it is composed entirely of stout hyphae much bent 

 and closely interwoven. The ectal layer resembles the ental one 

 in being made up of rounded thin-walled cells. These become 

 somewhat elongated toward the surface giving the latter a mealy 

 or pruinose appearance. 



