-474 Duraxd : Classification of the Fleshy Pezizineae 



which is quite easily separated from the inner one. The latter is 

 pseudo-parenchymatous throughout, being formed of large, irreg- 

 lar thin-walled cells 20-50/-/ in diameter. 



Hum aria purpurascens Pers. 



The Humarias are small, sessile, fleshy plants, without external 



H. 



pili. They grow usually on the ground. The sterile layers of 

 purpurascens occupy about one half the total thickness of the cup. 

 They are pseudo-parenchymatous throughout, and made up of 

 small, irregular, thin-walled cells, 8-15 \i in diameter. Those of 

 the hypothecium are smaller and obscure. 



Barlaea Constellatio (B. & Br.) Sacc. PL 27, Fig. 1 



The genus Barlaea differs from Humaria chiefly in possessing 

 spherical spores. • 



In the present species the hypothecium is made up of very 

 small pseudo-parenchymatous cells, measuring about 5 (i in diam- 

 eter. They are closely packed together, so that their character is 

 not easily made out. Grading off quite sharply from this layer is 

 the excipulum composed of rounded thin-walled cells, measuring 

 6-10 a in diameter. The character of these cells is quite uniform 

 throughout all parts of the layer. 



The genus OTIDEA. PL 28, Fig. 5 



The Otideas are fleshy, subsessile plants, usually with bright 

 • colors. They are peculiar in that the apothecium is much elon- 

 gated on one side, or vertically cleft or incised. They grow on the 

 ground or on rotten wood. 



Mr. G. Massee,* having made an examination of the British 

 species of this genus, sums up the results of his study of the sterile 

 layers in the following manner : Otidea neglecta, leporina, apophy- 

 sata, phlebophora and pleurota u have the excipulum composed of 

 densely interwoven hyaline hyphae, which become abruptly con- 

 verted close to the outside into a more or less colored cortex, con- 

 sisting of somewhat parallel septate hyphae, which sometimes 

 cohere laterally, and form an approach to a parenchymatous tissue 



Massee (1), p. 67. 



