362 



THAXTER. — MONOGRAPH OF THE LABOULBENIACE^E. 



with more than one species, but in the absence of abundant material they have been included with the 

 type. The latter is most nearly related to L. Asiatica, but should, I think, be kept distinct. 



Laboulbenia Asiatica Thaxter. Plate LXV, fig. 15. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 159. Dec, 1899. 



Perithecium and receptacle typical in form more or less suffused with dirty brownish yellow, the 

 perithecium somewhat smoky-brown above the basal wall-cells. Outer appendage consisting of a very 

 large subtriangular hyaline basal cell, which gives rise from a deeply blackened area of insertion to an 

 antero-posterior series of short stout cells, themselves outwardly blackened and bearing from one to three 

 branchlets, also placed antero-posteriorly and themselves mostly once branched in a similar plane; the 

 ultimate branchlets rather long and remotely septate, the lower septa blackened and somewhat oblique. 

 The inner appendage consists of a much smaller basal cell which gives rise on either side to a series of 

 from two to three branches arranged antero-posteriorly, the lower septa blackened and more or less 

 oblique, the branches once or twice branched, the branchlets shorter than those of the outer appendage. 

 Perithecium 140 X 45 /i. Total length to tip of perithecium 400-500 fi. Appendages (longest) 400 /i. 



On the elytra of Casnonia sp., Asia, Paris, No. 139. 



This species is exactly similar in the general form and appearance of its receptacle and perithecium, 

 to the common types of L. flagellata, but differs in the crest-like series of branches, distinguished by black 

 septa, that form dense tufts arising from the inner and outer basal cells of the appendages. The species 

 is most nearly related to L. celestialis, of which it may prove to be a luxuriantly developed condition. 



Laboulbenia Acrogenis Thaxter. Plate LXVI, figs. 6-8. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 154. Dec, 1899. 



Perithecium rather slender, free except at its base, pale yellowish or straw-colored, becoming yellow- 

 ish brown, tapering to the neck-like rather slender often almost clavate apex, the lip-cells hyaline, well 

 distinguished, the inner large and prominent often spreading, the pore obliquely external: below more or 

 less deeply suffused with smoky brown, especially the outer half, the posterior (outer) subterminal wall- 

 cells often becoming deeply suffused with smoky brown. Receptacle usually short, becoming slightly 

 suffused with yellowish brown, normal in form, sometimes slightly inflated between cells I and II. Outer 

 appendage consisting of a large rounded basal cell bearing four to eight branches arranged antero-pos- 

 teriorly in a more or less definitely double row, their insertions forming a continuous deeply blackened 

 area, their cells inflated, with blackened septa, successively once to three times branched antero-posteriorly. 

 The inner appendage consisting of a^much smaller basal cell producing from one to two branches similar 

 to those of the outer, one on either side. The antheridia solitary or from two to four, borne rather regularly 

 on the ends of short branchlets. Perithecium 90-175 X 28-35 //. Antheridia 14 [i long. Total length 

 to tip of the perithecium 190-360 [i. Appendages 85-100 /ul. Spores about 40 



Occurring on the inferior posterior margin of the prothorax and the adjacent portions of the thorax 

 of Acrogenys hirsufa MacLeary, Brit. Mus., Nos. 668 and 528, Australia, and Union Reefs, Australia. 



This species is nearly allied to L. Asiatica, the appendages being similarly arranged, though very 

 different in general appearance: the clear hyaline cells of the copiously divided branches inflated, and 

 strongly constricted at the blackened septa, five or six of which may occur successively from the base up- 

 ward. The conformation of the perithecium is distinctly different, especially at the tip, which is usually 

 even more prominently distinguished than is represented in the figures, the inner lip-cell considerably 

 enlarged to form a rounded or flat topped somewhat spreading termination. Two immature specimens 

 were obtained on Acrogenys from Union Reefs, in which the branches are more copiously developed and 

 the insertion-cell wholly unmodified. The antheridia, which are small and well formed, often occur in 

 terminal groups of three to five, closely appressed, almost as in some forms of L. Brachini. (Monograph, 

 Plate XX, fig. 7.) 



