THAXTER. — 



MONOOKAIMI OK TIIK I, A HOU U5KX f AC K/K. 



291 



septa, the distal one hearing a small sharp spine subtended by the usual minute hlaekish projection: 

 the subbasal cell producing apparently a single fertile branch which divides at once, growing in opposite 

 directions to form the somewhat irregular, and variably developed continuous secondary receptacles, 

 which may creep more or less extensively ; the component cells, which arc often very numerous, being 

 vertically elongated and becoming arranged in two more or less complete; rows; the inner mostly 

 fertile, producing perithecia of which there may be twelve or rarely more; the outer becoming several 

 times closely divided vertically, the cell-group which thus gives rise to the perithecial stalk, laterally 

 connected with corresponding adjacent cell-groups throughout its lower third only, the upper two thirds 

 forming a free, or nearly free, continuation of the perithecial stalk, forming no free protective margin 

 above, 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 asym- 

 metrical 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 con- 

 tinued 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 followed by 

 ;i 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) 

 producing 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 perithecium 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 dis- 

 tinguished from the posterior margin of the ascigerous 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 4.5-50 X 25 fi, terminal part to tip 28 ;i, anterior process 30-34 fi, 

 apical process 8 ft, stalk, including basal cells, 45-58 X 16-18 \i. Total horizontal extent of larger in- 

 dividuals including both receptacles 220 ft. Fertile cells below perithecial stalks 30-40 X 13-15 ft. 

 Total height to tip of perithecial process 175-200 [i. 



On Blabera sp. and Epilampra (?) sp., Panama; Mus. Comp. Zool., No. 13G4. On Epilampra sp., 

 No. 1360, St. Kitts, W. I. (type), No. 1366, Hayti. On a wingless form labelled "China?" All Mus. 

 Comp. Zool., and in all cases on the antennae. 



Although the perithecia of this species resemble very closely those of H. Nyctoborw in the disposition 

 of their spinous processes, the general form of the perithecium is quite different. The latter are further 

 borne on long stalk-cells which occur neither in H. Nycfoborce nor in the nearly allied II. Paranensis. 

 It differs also from all of the other bi- or tri-cuspidatc forms in the structure and mode of growth of its 

 secondary receptacles. The perithecia appear to mature more or less simultaneously; at least I have 

 seen no instances in which young and mature perithecia were associated on the same individual. The 

 male individuals vary considerably in their development, some producing perhaps a dozen antheridia, 

 or less, while in others a dense tuft is present containing many times this number. 



