MONOGRAPU OF THE LABOULBENIACEiE. 



353 



it cannot be by any possibility confused. The five types were found along the margins of the 

 abdomen beyond the tips of the elytra. 



Laboulbenia Guerinii Robin. Plate XXII, fig. 38. 



Robin Hist. Nat. d. Veg. Par. p. 64, Plate X, figs. 1-3 ; Peyritsch Sitz. d. Wien. Acad. Vol. LXVIII, p. 247 ; Sorokin, Veg. 

 Paras. Vol. II, p. 413, Plate XXXIII, fig. 780; Winter Die Pike Deutsch. II, p. 921 ; Berlese Malpighia, Vol. Ill, p. 

 54; Saccardo Sylloge Fung. Vol. VIII, p. 910; Thaxter, Proc. Am. Acad. Arts and Sei. Vol. XXVIII, p. 176. 



Becoming more or less suffused with smoky brown. Perithecium becoming almost opaque, 

 slightly inflated below, its upper half tapering evenly to the blunt apex, the lip-cells straight, the 

 inner forming a slight prominence. Appendages rather numerous, not equalling the tip of the 

 perithecium, once or twice branched ; the lower septa blackened, the intervening cells slightly 

 inflated, the insertion-cell apparently divided into several cells which are opaque and indis- 

 tinguishable. Receptacle distally rather deeply suffused, the basal and sub-basal cells hyaline or 

 translucent, normal, except that cells IV and V may be distally divided into a few small sec- 

 ondary cells. Perithecia, 110 x 55 /x. Appendages, 55 Total length to tip of perithecium, 

 800 ix. Robin's measurements are, — perithecia, 121 x 45 fi ; appendages, 30-55 ^ ; total length, 

 430 ii ; greatest breadth, 80 yu.. 



On G-yretes sericeus Laboulb., Caracas, Venezuela; on G. compressus Lec. (=6r. sinuatus Lec.) 

 Texas and Illinois. 



The North American specimens of this species differ from Robin's account only in their 

 somewhat shorter, stouter habit, which is doubtless due to the fact that they live on a smaller 

 host. The original figures represent slight differences in the appendages, which may well be 

 due to careless reproduction. In other respects the two forms correspond so closely that their 

 identity seems very probable ; although more abundant material of both is much to be desired. 

 The species is closely allied to L. Orectogyri, as above mentioned, and together with the two pre- 

 ceding and the following species forms a well-marked type within the genus. 



The present species occurs, like L. Guerinii, along the margins of the elytra of its aquatic 

 host. 



Laboulbenia Gyrinidarum Thaxter. Plate XXII, figs. 31-37. 



Proc. Am. Acad. Arts and Sci. Vol. XXVII, p. 39. 



Blackish brown, becoming nearly or quite opaque. Perithecium large, sub-conical or sub- 

 cylindrical, straight, the lip-cells nearly symmetrical, hyaline tipped, each producing a terminal, 

 short, straight, tapering, finger-like, converging outgrowth ; often wholly or partly aborted. 

 Appendages hyaline or becoming brownish below, arising in a broad dense tuft from an opaque 

 base, several times irregularly branched, rather closely septate below and constricted at the 

 blackened, often oblique, septa, the cells between which are more or less inflated, the ultimate 

 branchlets slender, hyaline, sub-erect, rarely equalling the tip of the perithecium. Receptacle 

 distally very broad, opaque, abruptly expanded above cell II, cell I usually curved and slender 

 and sometimes elongate. Spores, 90 x 7-8 p. Perithecia, 190 x 90/^. Appendages, longer. 

 100-150 fi. Total length to tip of perithecium, average, 375 p ; longer, 480 /u ; greatest breadth, 

 160 fi. 



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