400 



DESCRIPTIONS OF THE PLATES. 



Dichomyces princeps Thaxter. 



Fig. 11. Group of asci isolated by crushing. The three terminal asci show ascospores within 

 and all are adherent to the remains of the ascogenic cell. Leitz ^ 2. 



Peyritschiella curvata Thaxter. 



Fig. 12. Antheridium at the right, showing terminal pointed slightly inflated receptacle into 

 which the antherozoids are discharged from the cells just below it. Leitz oil ^ 4. 



Laboulbenia elongata Thaxter. 

 Fig. 13. Spore showing nuclei. 2. 



Fig. 14. Terminal portion of perithecium showing structure of lip-cells (lp), insertion of 

 trichogyne (tr), and "valve" of posterior lip-cell (x). ^ 4. 



Fig. 15. Portion of fertile branch bearing an antheridium, its structure shown in optical 

 section. ^ 4. 



Fig. 16. Protoplasmic connections of the "stalk-cell" and basal cells of the perithecium 

 indicating the successive origin of each. Drawn from a specimen in which the cells had been treated 

 with potash and stained with eosin. The appendage lies at the left. J 2. 



Fig. 17. A specimen similarly treated and viewed from the opposite side. The appendage lies 

 at the right. In both figures the stalk-cell is marked (p), the posterior basal cell (o'), the secondary 

 stalk-cell (h), the anterior basal cells, left (g), right (d), and the four basal wall-cells of the peri- 

 thecium (e, i, f, j), the cell (j) not being visible in fig. 17. J 2. 



Fig. 18. A specimen similarly treated, slightly crushed so as to separate the basal cells without 

 destroying the ascus mass and the inferior supporting cell, the protoplasmic connection of which 

 with the secondary stalk-cell (h) is unbroken, as well as the connections of the two anterior basal 

 cells with the parietal (pc) and wall (f, j) cells above them. The protoplasmic portions only of 

 these cells are indicated, the lettering corresponding to that of the two previous figures, except that 

 (is) represents the inferior supporting cell of the ascus apparatus, (am) the ascus mass and ascogenic 

 cells, and (pc) the parietal cells of the perithecium. 



