18 PROCEEDINGS OF THE AMERICAN ACADEMY. 



out its lower third only, the upper two thirds forming a free, or nearly- 

 free, continuation of the perithecial stalk, forming no free protective 

 margin ahove, while below they develop a continuous, irregularly lobed, 

 spreading haustorial margin in close contact with the host. Perithecia 

 raised on a well-developed stalk, consisting of two unequal and asymmet- 

 rical cells placed side by side ; that on the side toward which the tip of 

 the perithecium is bent (anterior) attenuated below and extending higher 

 than the posterior, which becomes narrower upward from its broad base ; 

 the stalk becoming gradually and slightly broader from below upward, 

 and directly continued by the base of the perithecium from which it is 

 not distinguished. Ascigerous portion of the perithecium distinguished 

 from the base by a very slight prominence, and about as long as the 

 stalk and base combined ; becoming distally slightly broader, the two 

 lower tiers of wall-cells separated by a slight elevation ; the third wall- 

 cell of the anterior row small, and forming a prominent elevation fol- 

 lowed by a depression which subtends a large, erect, tapering, bluntly 

 pointed, distally incurved spinous process formed by an outgrowth of the 

 lowest cell in the anterior row of wall-cells of the distal portion (fourth 

 anterior wall-cell) which extends upward higher than the tip of the 

 perithecium, its upper two thirds forming a free spine ; the lower cell 

 of one of the corresponding lateral rows (fourth lateral wall-cells) pro- 

 ducing a similar process, shorter, slightly sharper, curved inward distally 

 toward the apical pore, this process always external in relation to the 

 host and thus developed on the right or left side according as the peri- 

 thecium is formed from the receptacle at the left or at the right of the 

 original insertion toward which the anterior sides of all the perithecia 

 are turned : the rest of the terminal portion above the bases of these 

 outgrowths short, abruptly tapering, its outer margin vertical, slightly 

 prominent and not distinguished from the posterior margin of the asciger- 

 ous portion, which is directly continued by it; its inner margin running 

 abruptly inward and upward from the base of the anterior process to the 

 small blunt tip, which is curved abruptly inward and is subtended by a 

 nearly erect, short, sharp spinous process ; the whole nearly symmetrical 

 with the anterior process which is very slightly longer. Spores about 

 12/i long. Perithecia, ascigerous portion 45-50 X 25 /x, terminal part 

 to tip 28 fi, anterior process 30-34/1, apical process 8 /x, stalk, including 

 basal cells, 45-58 X 16-18 /x. Total horizontal extent of larger individ- 

 uals including both receptacles 220 /x. Fertile cells below perithecial 

 stalks 30-40 X 13-15 /x. Total height to tip of perithecial process 

 175-200 /x. 



