TUBE RALES 



355 



true Discomycetes; some of them, however, apparently from lack of 

 room, lie crosswise in the subhymenium. 



In Balsatnia the characters just sketched for Hydnotrya are still more 

 marked. The verrucose rind usually consists of pseudoparenchyma. 

 The palisade arrangement disappears and the clavate asci become ellip- 

 soidal or spherical as space permits. In Pseudobalsamia the cavities still 

 open outward, as in Hydnotrya. In the Californian Pseudobalsamia 

 magnata (P. Setchelli) the majority of the cavities run toward a pitted 



Fig. 237. — Hydnotrya Tulasnei. 1. Longitudinal section of mature fructification. 2. 

 Section of portion of hymenium. 3. Ascus. (1 X %; after Tulasne and E. Fischer.) 



depression in the top of the fructification (Fig. 238). In Balsamia, sensu 

 strictiore, the openings generally disappear so that after a certain time the 

 chambers form true cavities (E. Fischer, 1908; Bucholtz, 1910). In 

 certain forms, as P. magnata (Fig. 238), we meet another peculiarity which 

 will play a decisive role in the further form of the Hydnotrya-Tuber 

 series; in these forms, the paraphyses (as in the epithecial formation of 

 many Pezizales) continue their growth out over the hymenium and inter- 

 twine over the top of the asci with the paraphyses of the opposite side, 

 forming a loose tissue which fills the cavities for a long distance (indicated 

 in Fig. 238 by a light stippling). 



