'PI I A XT Kit. 



MONOGRAPH <>K THE LABOULBENI AC EM . 



STICHOMYCES Thaxter. 



Proc. Am. Acad. Arts and Sci., Vol. XXXVII, p, .T7. Juno, 1901. 



Receptacle consisting of two cells, the upper bearing one or more perithecia laterally, and an antheri- 

 dial appendage terminally. The appendage consisting of several superposed cells, the lowest normally 

 sterile, those above it bearing opposite lateral brandies distally, the scries ending in a terminal sterile 

 branch. Antheridia simple flask-shaped, I'rce, borne in small groups on short branchlets. 



The two species included under this name are so unlike, that the inclusion of S. HlUicolux must be 

 regarded as only provisional. It is therefore somewhat difficult to define the limits of the genus with 

 great exactness. In >S. (Umosomw the perithecia are often several in number, budding from the subbasal 

 cell of the receptacle or from the usually sterile cell above it, which normally forms the base of the append- 

 age. The main axis thus becomes a series of superposed cells which, except the basal ones, separate by 

 an oblique septum distally, on one or both sides, perithecia, in the case of the two lower cells, and antheri- 

 dial branches in the others; the series ending in a long terminal "appendage." An examination of more 

 species is needed to indicate the limitations of the genus and its immediate relationships. Among the 

 other genera it approaches Rhizomyces in the character of its appendage, but the resemblance is other- 

 wise slight. 



STICHOMYCES Conosom.e Thaxter. Plate LI, Figs. 7-10. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVII, p. 38. June. 1901. 



Dull amber-brown. Receptacle and appendage undifferentiated, the basal cell of the former small, 

 triangular in outline; the subbasal cell about as broad as long, and similar to the cells of the appendage, 

 bearing distally and laterally a single perithelium, sometimes two, which are then paired on opposite 

 sides of the cell, like the antheridia! branchlets. Appendage consisting of five superposed subequal cells 

 slightly longer than broad, the basal one sterile, or not infrequently producing one or two perithecia as in 

 the subbasal cell below it: the three cells above slightly larger, the upper angles separated by oblique 

 septa to form small cells on either side, which bear short one- or few-celled antheridia! branchlets; the 

 terminal cell somewhat smaller, bearing a simple terminal several-celled branch in addition to the lateral 

 branchlets, all of which usually appear to be sterile. Antheridia with broad necks grouped in twos or 

 threes. Perithecium darker brown, more or less symmetrically inflated; the tip hardly modified; the 

 basal cells collectively broader and nearly as long as the stalk-cell. Spores 35 X 2.5 /£. Perithecia 85 

 X 25 fi, the stalk-eell 3G X 14 ft. Total length to tip of the appendage proper 150 fi, the terminal branch 

 150 /(, the antheridia] branchlets about 20 a. Total length to tip of perithecium 1S5-200 ft. 



On Conosoma pubescens Payk. Belmont and Waverley, Mass. First observed by Mr. Bullard. 

 Kittery Point, Maine. 



This species is not uncommon on its active host, sometimes in company with Smprincjmrujcea; but 

 is usually found in rather poor condition; the terminal portion becoming easily broken, or injured, so 

 that an abnormal production of branchlets takes place. It occurs on all parts of the host, but especially 

 on the elytra. 



Stichomyces Stilicolus Thaxter. Plate LI, figs. 11-14. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVII, p. 24. June, 1902. 



Hyaline, becoming tinged with yellowish, the perithecia becoming pale amber-brown. Subbasal cell 

 of the receptacle about twice as long as the basal cell; the stalk-cell of the perithecium and that of the 

 appendage symmetrically divergent, or the former lateral in position. The appendage consisting of a 

 free, relatively long, distally somewhat enlarged basal cell, and two to four much smaller distal cells; 

 the lower of which give rise from their upper angles to short branches bearing free antheridia, usually in 

 pairs; the distal cells producing sterile branches which are more or less elongate, hyaline, and sparingly 

 branched. Stalk-cell of the perithecium very large and stout, inflated or distally enlarged below the 

 rather inconspicuous basal cells; body of the perithecium relatively small, becoming amber-brown, curved 



