Til WTKli. 



MONOGRAPH OF THK LA MOT LBION I AC l',.V.. 



301 



the antheridium separated from the distal cell of the receptacle by a somewhat oblique septum, and 

 nearly similar to that of the stalk-cell of the perithecium, to which it is closely adnatc on its inner side, 

 the Stlbbasal cell very small and becoming scarcely distinguishable in mature individuals; the two cells 

 above it similar, rather distinctly differentiated, the pair forming a slight symmetrical enlargement; the 

 terminal cell above, larger and longer than these two cells combined, the base of the lower antheridiiiin 

 extending its whole length; both this and the terminal antheridium above it relatively large, the necks 

 very long, straight or but slightly bent and somewhat divergent. Stalk-cell of the perithecium somewhat 

 broader than long, the basal cells small, the perithecium proper relatively large and somewhat inflated 

 above the base, distallv tapering gradually to the tip; the lip-cells forming four corresponding projections, 

 the anterior larger and broader, the posterior narrow and bluntly pointed, subtended by a more or less 

 well defined bump; the two lateral usually shorter blunt, slightly divergent, sometimes not clearly differ- 

 entiated, varying in shape and position. Spores 35 X 3.5 //. Perithecia 75-95 X 25-32 /*, the stalk- 

 cell 10 12 fi. Appendage above basal cell to tip of antheridium, 36 //. Antheridia 21 25 Receptacle 

 '_'() 25 u. Total length to tip of perithecium 125-150 /<. 



( )n the superior surface of the abdomen of a species of HomcUota. Intervale, N. II. 



This species appears to be very rare, since, although diligent search was made for it, a single infested 

 specimen of the host, only, was found. The latter occurred in decaying agarics in the Merriman Woods. 



STIGMATOMYCES Karsten. 



A notable addition is made to this genus since the publication of my Monograph, including nineteen 

 species, a majority of which are either American forms, or derived from a collection of Diptera made 

 by Dr. Dahl in New Pommerania near New Guinea. All of the species, with a single exception, grow 

 upon Hies, and it is quite certain that those which have been described represent but a small fraction of 

 the forms which actually exist. The genus is in some respects a very difficult one to treat systematical!}', 

 the type-structure being very simple, and the species sometimes varying very greatly; as in the ease of 

 S. purpureus, which, although in its typical condition it is one of the most striking and clearly defined 

 forms, both from its peculiar violet-blue or purple color and the nodulose ridges of its perithecium, varies 

 to smaller and simpler conditions in which these characters are almost wholly lost. 



The antheridia] appendage in this, as well as in so many other genera, furnishes the most reliable 

 characters, not only for the characterization of the genus, but of the different species as well, and possesses 

 a very well marked and individual type of structure. It consists of a stalk-cell more or less well developed 

 and always partly or usually wholly united to the receptacle, that is succeeded by a basal cell which is 

 usually, although not invariably, peculiarly modified in color and in structure. The characteristic cup- 

 like thickening of the inner layers of the wall of this cell, above the basal septum, which is so strikingly 

 developed in Arthrorhynchus Cychpodiee, is often prominent, as in fig. 22, Plate XLVII, is perhaps con- 

 nected with the mechanism by which the whole appendage undergoes a quarter or a half turn; so that 

 the antheridia, which were originally directed toward the trichogyne, become turned away from the 

 mature perithecium. This basal cell, which may or may not itself bear antheridia, as is shown in figs. 

 18 and 36, Plate XLVI, is succeeded above by a series of superposed cells which form the main axis of 

 the appendage and vary in number in the different species. 



The simplest type of appendage is that illustrated by 8. purpureus, Plate XLVI, fig. 3G, in which the 

 basal cell is not only unmodified but sterile, the axis above it consisting of but three superposed cells, each 

 bearing a single antheridium; the series end'ng in a fourth terminal cell which is converted directly into 

 a spinose antheridium. The spine, which persists in a similar fashion in various other genera, notably 

 in Eucautharomyces, being the original subulate termination of the germinating spore, it is evident that 

 the cell which bears it is a primarily terminal structure and not one which has resulted from secondary 

 proliferation. In this connection, however, it should be mentioned that the spine is not always attached 



