Proceedings of the American Academy of Arts and Sciences. VOL. XLVIII. No. 7.-SEPTEMBER, 1912. CONTRIBUTIONS FROM THE CRYPTOGAMIC LABORATORIES OF HARVARD UNIVERSITY. - No. LXIX. NEW OR CRITICAL LABOULBENIALES FROM THE ARGENTINE. BY ROLAND THAXTER. CONTRIBUTIONS FROM THE CRYPTOGAMIC LABORATORIES OF HARVARD UNIVERSITY. - No. LXIX. NEW OR CRITICAL LABOULBENIALES FROM THE ARGENTINE. BY ROLAND THAXTER. Presented April 10, 1912. Received July 28, 1912. THE rapid accumulation during the past six years of Laboulbeniales, which have come to me from various parts of the world and now include some hundreds of new species and genera, has forced me to abandon my intention to figure all new forms as they were published; and it has again become necessary to resort to preliminary diagnoses, a third series of which is entered on with the present paper. It is, however, my purpose to illustrate all the species described in this series as soon as the necessary figures can be prepared and published. The exotic material which is now available is not only very varied, but is in far better condition than that which has formerly been obtained from dried specimens of insects, for the reason that a majority of the hosts have been collected directly into alcohol and the parasites removed before drying. The examination of large series of forms in good condition has inevitably led to some modification of my views in regard to the limitations of certain genera and species, and while it has in some instances made clearer relationships or differences that were formerly in doubt, it has at the same time served to break down distinctions which were formerly regarded as more or less crucial, so that it has seemed best to modify the treatment of certain genera and species. Thus in the present paper, the limits of Corethromyces, for example, are considerably extended to include several genera hitherto kept distinct, and other changes will be noticed applying both to species and genera, which have seemed advisable in the light of a more complete knowledge of numerous forms. The materials here considered were collected in Argentina, chiefly in the Buenos Aires region, the host insects having been captured for the most part by myself in the Parque 3-de-Febrero, at Palermo, a suburb on the river above Buenos Aires: in the grounds of the Escuela Regional de Santa Catalina near the station of Llavallol, where a small planted wood of various trees affords a good collecting ground already familiar to mycologists, by name at least, from the large number of fungi collected there and described by Prof. Carlos Spegazzini, to whom I am much indebted for guiding me to this locality as well as to the Isla de Santiago near La Plata, where I spent two days collecting. Many hosts were also obtained in the grounds of the Quinta Mackern, at Temperley, a town about ten miles south of Buenos Aires, where I spent several weeks in the spring of 1906. To Dr. Propile Spegazzini I am greatly indebted for numerous miscellaneous beetles which he kindly collected for me at La Plata and in Tucuman, both during my visit and after my return to the United States: to the Director of the Museo Nacional at Buenos Aires, and to Dr. J. Brèthes I am under obligations for various courtesies and for the privilege of examining the entomological collections of the Museum. For the determination of certain of the hosts I am indebted to Mr. Samuel Henshaw, Dr. Fenyes, Dr. Max Bernhauer, M. Pic, Dr. Malcolm Burr, Dr. Erno Csici and Col. Casey. To all these gentlemen I desire to express my appreciation of their kindness in thus assisting me. With the exception of perhaps a half dozen species, of which the material is either too scanty or not in condition for description, the following enumeration includes all the forms obtained. As will be seen, a majority of them are hitherto undescribed, but it has seemed desirable also to append a list of the species obtained which are already known, and are listed below in alphabetical order. Of these there are in all forty-nine species, while of the new forms sixty-eight are included, with nine new generic types. Dimeromyces Anisolabis nov. sp. Male individual, quite hyaline. Receptacle consisting of four superposed cells obliquely separated, except the upper; the basal subtriangular, larger than the two subequal cells above it, of which the upper always bears an antheridium, while a second may often arise from the cell next below it. The antheridia rather stout and short, the venter and stalk-cells about as long as the abruptly distinguished stout neck, which is bent abruptly outward distally. Appendage consisting of three superposed cells subtended by a more or less conspicuous somewhat prominent red-brown septum; the tip of the appendage hardly extending to the tip of the antheridium. Total length to tip of antheridium, including foot (7 μ), 58 μ. Appendage 20 μ. Receptacle, exclusive of foot, 18-20 μ. Antheridium, including stalk-cell, 31 X 8 μ. Female individual, almost hyaline, the perithecium becoming faintly yellowish. Receptacle consisting of five successively smaller cells superposed obliquely, except the uppermost which subtends the primary appendage, and from which it is separated by a red-brown septum, the subterminal cell also bearing a similar somewhat larger, usually five-celled appendage, distinguished from its small subtending cell by a red-brown septum; the subbasal cell of the receptacle bearing a still larger appendage, the somewhat irregular subtending cell of which projects on its inner side and is distally and externally separated from the slightly divergent and inflated portion of the appendage by a narrower deeply blackened isthmus, which includes a portion of the subtending cell, and more than half of the basal cell of the appendage proper. Perithecium usually single, a second rarely developed from the terminal cell of the receptacle, arising between its two appendages; long slender slightly enlarged distally, the tip not clearly distinguished, tapering slightly, inflated at the apex. Perithecia 75-100×14 μ. Receptacle, exclusive of foot, 25-30×20 μ. Primary appendage about 40 μ. Lowest appendage, including its subtending cell, 60-70 μ. Total length to tip of perithecium, including foot, 100-150 μ. On the inferior surface of the abdomen, near the tip, of Anisolabis annulipes Luc., Palermo, No. 1682. This species is very closely allied to D. Forficulae, and may prove only a variety, although the abundant material does not indicate that the form is variable. The male is most readily distinguished by the presence of only one suffused septum in its appendage, as well as by its shorter stouter form and outcurved antheridial necks. The two appendages arising in the female of D. Forficulae from the terminal cell of the receptacle, are replaced by only one, and the character of the lower appendage, and the form of the perithecium are also different. A third closely allied form is known to me from the Amazon region. Dimeromyces Corynitis nov. sp. Male individual, straw-yellow, the receptacle straight, or but slightly curved, consisting of a single series of from three to eight superposed cells, the basal usually larger; the rest small, broader than long, all |