274 



THAXTER. MONOGRAPH OF THE LABOTJLBENTACEiE. 



position, whether seen from the right or from the left would have the appearance seen in fig. 15, in which 

 the necks of the antheridia, toward the median line, are shown partly in optical section running obliquely 

 upward. All the antheridia open by longer or shorter necks into a median cavity, as is shown in fig. 18 

 which is a not quite median optical section. This cavity seems to be single, and from it the antherozoids 

 make their escape by a common aperture between the mouth cells, which as is Monoicomyces, are cut 

 off from the third or upper tier of the main appendage, and which may later grow up into appendages as 

 is shown in fig. 12. The somewhat dumbbell-shaped bulge of the upper tier-cells is somewhat exaggerated 

 in fig. 15, which is somewhat confusing in that it combines a surface view with some of the appearances 

 seen in optical section. The nature of the central cavity, whether a cell-cavity or an intercellular space, 

 has not been determined in this or the preceding genus. This antheridium is the most highly developed 

 organ of the kind in the whole group of Laboulbeniales there being perhaps seventy-five or more functional 

 antheridial cells in each antheridium, but in the other species of the genus it is much less complicated; 

 although, as far as can be determined from the insufficient material, the type is the same in all three. 



Eumonoicomyces Papuanus Thaxter. Plate XXXVII, figs. 11-18. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVII, p. 22. June, 1901. 



Nearly or quite hyaline. Basal cell of the receptacle small, usually triangular; the subbasal cell 

 terminating in a short appendage, distinguished by a dark basal septum, and sometimes once-branched. 

 The fertile branch not differentiated from the receptacle, consisting of three, rarely two cells similar to the 

 subbasal cell, obliquely superposed; the lowest bearing normally a closely approximated pair of short, 

 hyaline or faintly brownish, erect, sterile appendages, similar to that of the subbasal cell; the middle cell 

 smaller, bearing a single antheridium, and the upper an antheridium and a stalked perithelium. The 

 antheridia rather stout, broader distally; the stalk-cell small and short; the antheridial cells very numer- 

 ous, the terminal appendages of the usual type, short or seldom longer than the antheridium. Perithecium 

 rather long and sometimes slender; the venter inflated; the distal portion tapering gradually and sym- 

 metrically to the blunt, nearly truncate apex; the rather short tip hardly distinguished above a slight ele- 

 vation; the stalk-cell variable in length, rather slender, seldom more than half as long as the perithecium; 

 the basal cells rather large and broad, not distinguished from the venter. Spores about 35 X 3 //. Peri- 

 thecia 80-120 X 32-40 /*, the stalk-cell 35-75 X 15 //. Antheridia including stalk-cell and without ap- 

 pendages 35 X 18 /i. Total length to tip of perithecium 150-290 ji. 



On all parts of a small pale Oxytelus'! Ralum, New Pomerania. Berlin Museum, No. 1011. 



Several hosts bearing this species were found among the alcoholic material brought by Dr. Dahl from 

 the East Indies. The sterile appendages of the fertile branch, although they appear to be solitary when 

 viewed from one side, are in reality paired, exactly like those of Monoicomyces. The terminal cell of 

 the primary appendage is spinose as shown in fig. 13. 



Eumonoicomyces Californicus Thaxter. Plate XXXVII, figs. 9-10. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVII, p. 22. June, 1901. 



Resembling E. Papuanus in general habit. Basal cell of the receptacle short, stout, geniculate, 

 with a dark brown suffusion extending from the foot half-way up its convex margin ; the subbasal cell 

 bearing distally a long appendage consisting of a short hyaline basal cell, separated by a dark septum 

 from a second cell above it, which is dark brown and bears two long, slender, one-celled, erect branches, 

 brown below, becoming hyaline distally. The fertile branch not distinguished from the receptacle and 

 consisting of three, sometimes more, very obliquely superposed cells similar to the subbasal cell : the lowest 

 bearing a sterile appendage like that which terminates the receptacle ; the middle cell usually bearing an 

 antheridium, and the upper an antheridium and a perithecium. Antheridium short-stalked, with a more 

 or less well-defined median constriction resulting from an inflation of the cells which bear the terminal 

 appendages. The latter very long, brown, extending beyond the tip of the perithecium. Perithecium 

 short and stout, the venter inflated, the much shorter neck-like distal portion abruptly distinguished, the 



