298 



MONOGRAPH OF THE LABOULBENIACEiE. 



stalk-cell of the perithecium arise from the sub-basal cell of the receptacle, as in so many other 

 cases. The tip of the perithecium is peculiarly modified in the single species ; but more exact 

 information is needed on this point. 



Helminthophana Nycteribi^e Peyritsch. Plate VIII, fig. 10 (after Peyritsch). 



Sitz. d. Wien. Akad. LXVIII, p. 250 ; Sorokin Veg. Paras. Vol. II, p. 423, Plate XXXII, fig. 759 : Winter Die Pilze Deutsch. 



II, p. 924, p. 920, fig. 3.; Berlese, Malpighia, Vol. Ill, p. 58; Saccardo Sylloge Fung. Vol. VIII, p. 913; Arthro- 

 rhynchus Westrumbii Kolenati, Wiener Entom. Monatsclir. (1857), p. 68 ; Diesing. Sitz. d. k. Akad. d. Wissensch. Wien, 

 1859, Vol. XXX VH, p. 752, Plate I, figs. 1-3 ; Arthrorhynchus Diesingii Kolenati, 1. c. Diesing 1. c. fig. 4. 



Perithecium brownish yellow, its basal half slightly inflated, abruptly narrowed to the sub- 

 cylindrical distal half, the apex composed of two series of small roundish cells, the upper form- 

 ing four papillate prominences around the pore ; the base consisting of four small cells 

 terminating a long nearly cylindrical stalk-cell arising from the very small sub-basal cell of the 

 receptacle. Antheridial appendage arising from the sub-basal cell of the receptacle, its lower 

 half consisting of a single cylindrical stalk-cell, its upper of a single sterile cell above which 

 three superposed cells form an axis from which arise the antheridia in four vertical rows. 

 Receptacle of two cells, the basal roundish without any blackened foot. Total length to tip of 

 perithecium, 390-750 /x. 



On Megistopoda Westwoodii Kol., Acrocholidia Montaguei Kol., Nycteribia Dufourii, Middle 

 Europe. 



The two species described by Kolenati under the genus Arthrorhynchus are said by Peyritsch 

 to be identical, although since they occur on generically distinct hosts it is not impossible that 

 they may prove to be different. The original descriptions being based on supposed zoological 

 characters, are quite unintelligible ; while the figures of Diesing, apparently drawn from dry 

 material, give no clue to any specific differences. 



The hosts are wingless, dipterous parasites of bats, of which I have examined several Ameri- 

 can specimens, on which no Laboulbenias were to be found. 



STIGMATOMYCES Karsten. Plate VIII, figs. 1-9 ; Plate I, figs. 1-26. 



Chemismus der Pflanzenzelle, p. 78, Wien, 1869. 



Receptacle consisting of two superposed cells, the upper giving rise to the single peri- 

 thecium on one side and to the single appendage on the other. The perithecium various in 

 form, stalked or sessile, sometimes appendiculate. Appendage consisting of an axis of super- 

 posed cells from which are developed on one side a single row of superposed antheridia separated 

 from them by a septum or by a small cell. The antheridial cells flask-shaped, the venters more 

 or less united, the necks projecting independently. Trichogyne simple, short, filamentous. 

 Spores once septate. 



This genus, although the three species that it contains are very diverse in form and appear- 

 ance, is yet clearly characterized by the structure of its antheridial appendage ; the latter being 

 unlike that of any other genus with the exception of Idiomyces, which it only remotely resem- 

 bles. As will be seen by examining the figures on Plate I, the appendage is formed from the 



