NEW LABOULBENIALES. C)71 



among them the two most clearly distinguished types. This has been 

 largely owing to the fact that, despite their considerable difl'erences in 

 form and cell relation, the appendage is in general very similar in all; 

 ending in two superposed antheridia, the upper spinose; while of its 

 three axis-cells the basal bears three, the subbasal two and the distal 

 single antheridia, all of which are superposed in a single row with 

 little if any of the usual right and left diA'ergence. The basal cell, 

 moreover, is somewhat colored and persists, keeping its form, while 

 the rest of the appendage is quite hyaline and usually shrivels at an 

 early stage, so that its exact structure is ascertained with difficulty. 

 The form and relative development of the receptacle and perithecium, 

 however, vary greatly; and although there are two well distin- 

 guished types, both of which may occur in the same position on the 

 hosts abdomen, those which grow elsewhere often vary so consider- 

 ably that it is difficult to determine whether they should be regarded 

 as distinct species, and, if not, to which of the two primary species 

 they should be referred, if they are treated as varieties. The follow- 

 ing disposition of them must therefore be regarded as tentative. 



Stigmatomyces curvirostris nov. sp. 



Pale yellowish, the venter of the perithecium becoming tinged with 

 amber-brown, its surface at maturity transversely finely granular- 

 punctate. Basal cell of the receptacle somewhat longer than broad, 

 somewhat narrower below; the subbasal cell of the same width and 

 about twice as long, separated by a horizontal septvmi, its upper half 

 or two thirds overlapped by the long slender stalk-cell of the append- 

 age; which tapers very slightly to its base, and is rather abruptly and 

 prominently rounded below the basal cell of the appendage, where 

 it is tinged with amber-brown. Appendage consisting of four cells; 

 rather long, slender and distally attenuated; the insertion hori- 

 zontal and on a level wath the distal end of the secondary stalk-cell 

 of the perithecium, the basal cell twice as long as broad, or less, tinged 

 with amber-brown, bearing distally from a very oblique insertion, three 

 superposed antheridia, the upper two of which lie closely against 

 the margin of the subbasal cell ; the latter, and also the cell above it, 

 as large or longer than the basal cell, separating two superposed an- 

 theridia each; the fourth cell, separating a single antheridium, and 

 surmounted by two superposed antheridia which terminate the append- 

 age. Stalk-cell and secondary stalk-cell of the perithecium of about 

 equal length, the two combined more than twice as long as broad, 



