150 



Mycologia 



are several large amber colored sporodochia of Hainesia and not 

 a single ascOcarp of the Pezisella. The white appearance of the 

 apothecia when moist is due mostly to the presence of a muci- 

 laginous substance including large quantities of small globules. 

 Addition of water produces a sort of emulsion which spreads in a 

 white layer over the flat disc. This epitheciai' substance may oc- 

 cur as the result of the disorganization of the upper ends of the 

 paraphyses which in young ascocarps extend somewhat above 

 the ends of the asci. The photograph {pi. 10, figs, ip, 21) shows 

 some of this substance that persisted through the imbedding and 

 sectioning processes. 



Fig. 4. Semi-diagrammatic view of a portion of the margin of the discocarps. 



The stipe-like basal portion and the side walls of the apothe- 

 cium are composed of a pseudoparenchymatous (plectenchyma- 

 tous) tissue of light brown cells. At the margin the cells elongate 

 forming a border of narrow cells arranged side by side {text- 

 fig. 4). In view of this peculiar border or margin it is very likely 

 that the apothecium is not " at first closed," strictly speaking, 

 but from the appearance of the young fruit bodies as they break 

 through the upper wall and cuticle of the epidermis they would 

 commonly be said to be " closed at first then opening irregularly.''' 

 Whether the apothecium has a true stalk may be questioned. 

 Sections show the base to be variable, in some cases at least stalk- 

 like {pi. 10, fig. 22), and at others simply tapering downward 

 and funnel-shaped. Perhaps the shape of the apothecia of those 

 species placed by Boudier (1910) in the genus Micropodia best 

 represents the condition found here. 



The asci are cylindrical, about 55-70 X 7-8 {text- fig. 5). 

 The apex is not colored blue by iodine. Sections show that the 

 ascus is truncate at the apex and would probably be called mar- 

 ginate by Boudier, although this does, not show at all in speci- 

 mens crushed out on a slide. 



The ascospores are straight or slightly curved, occasionally 



