358 



MONOGRAPH OF THE LABOULBENIACE^E. 



second pair of perithecia arise in all probability from secondary divisions of tbe pair of perithecia- 

 bearing cells above described ; but the exact structure in this region, behind the stalk-cells of the 

 perithecia, has not been made out satisfactorily. An obliquity in the septum which separates 

 the basal and sub-basal cells sometimes results in the apparent absence of any sub-basal cell. 



Diplomyces Actobianus Tbaxter. Plate X, figs. 18-21. 



Proc. Am. Acad. Arts and Sci. Vol. XXX, p. 469. 



More or less faintly tinged with brownish. Basal cell of receptacle triangular, sub-basal 

 cell flattened or wedge-shaped ; the posterior prominences peculiar to tbe genus nearly as long- 

 as the receptacle itself, slightly divergent, two-celled, the terminal cell twice as long as the 

 basal, tapering slightly towards its rounded extremity. On the anterior side the two perithe- 

 cigerous cells bear the first pair of perithecia on short stalk-cells bent abruptly upward, diver- 

 gent, and succeeded by three small cells forming the base of the pcrithccium. The perithecia 

 rather slender, curved towards the receptacle, so that their tips project beyond it, divergent, 

 rather long and slender, tapering slightly, the apex blunt with ill defined lips, the base of the 

 old trichogyne persisting conspicuously below the pore. Appendages branching, arranged in 

 pairs symmetrically like the peritliecia ; a smaller one arising just behind the stalk-cell of the 

 perithecium, a much larger one above this followed by a few smaller ones less definitely arranged 

 in the region whence a second pair of perithecia may arise. All the appendages more or less 

 copiously branched, the branchlets terminating in many cases by the slender, curved, and sharply 

 pointed cells characteristic of Teratomyces. Spores, 32 X 2 fi. Perithecia, including stalks, 

 about 75 x 12 /x. Receptacle to tips of prominences, 75 fi. Total length to tip of perithecia, 

 110 p. Greatest width, 37 /j,. 



On Actobius nanus Horn, Massachusetts. 



This species occurs leather rarely on the abdomen of a large brown variety of Actobius 

 nanus, but not as far as has been observed on the normal form. A second species, perhaps dis- 

 tinct from the present, was found on the abdomen of a small Philonthus, and is distinguished 

 by the presence of slender thread-like branches from the larger appendages. Sufficient material 

 of this form was not, however, obtained, and it may prove to be nothing more than a variety of 

 the one above described. 



RHACHOMYCES Thaxter. Plates II, IV, X-XII. 



Proc. Am. Acad. Arts and Sci. Vol. XXX, p. 468 ; Acanthomijces Thaxter (nec Lebert), 1. c. Vol. XXVII, p. 36. 



Receptacle consisting of a single basal cell surmounted by a more or less elongated body 

 composed on one side of a primary series of superposed nearly equal cells ; on the opposite side 

 of a second series, of smaller and more numerous cells bearing large numbers of bristle-like 

 appendages, extending up to and more or less surrounding the base of the perithecium. Peri- 

 thecia produced laterally near the tip of the receptacle, at maturity apparently terminal, stalked 

 or nearly sessile, symmetrical. Spores once-septate. Antheridial cells single, terminal on short 

 stalks. 



