258 



MONOGRAPn OF THE LABOULBENIACE.E. 



Order II. Laboulbenieae. Antheridial cells distinct, discharging independently. 



A. Dioecious. 

 Genus I. Amorphomyces. 



(1) A. Falagriae Thaxter, on Falagria dissecta Er., N. America. 



(2) A. floridanus Thaxter (species pro tern. ) on Bledius basalis Lee, N. America. 



B. Monoecious. 



* Antheridia borne in definite series on the appendages. 

 x. Antheridia springing directly from successive cells of the appendage. 

 Genus II. Helminthophana. Appendage solitary, bearing the antheridia in four vertical 

 series. 



(1) H. Nycteribise Peyritsch, on Megistopoda Westwoodii Kolen., Acrocholidia Montaguei 

 Kolen., and Nycteribia Dxfourii, Europe. 

 Genus III. Stigmatomyces. Appendage solitary, bearing the antheridia in a single vertical 

 series. 



(1) S. entomophila (Peck), on Drosophila nigricornis Loew., N. America, Drosophila fune- 



bris L., Europe. 



(2) S. Baeri Peyritsch, on Musea domestica L., Europe. 



(3) S. virescens Thaxter, on Chiloaorus bivulnerus Muls., N. America. 



Genus IV. Idiom yces. Appendages numerous, bearing the antheridia in three vertical 

 series. 



(1) I. Peyritschii Thaxter, on Deleaster dichrous Grav., Europe. 



xx. Antheridia borne on branches of the appendages. 

 Genus V. Corethromyces. Appendages forming a tuft, the autheridial cells superposed and 

 forming lateral branchlets. 



(1) C. Cryptobii Thaxter, on Cryptobium pallipes Grav., C. bicolor Grav., N. America. 



(2) C. setigerus Thaxter, on Lathrobium nitidulum Lee, N. America. 



(3) C. jacobinus Thaxter, on Lathrobium jacobinum Lee, and L. collare Er. 



Genus VI. Rhadinomyces. Appendage single with terminal sterile branchlets ; antheridia 

 superposed in short series forming branchlets near its base. 



(1) R. cristatus Thaxter, on Lathrobium nitidulum Lee, L. punctulatum Lee, N. America. 



(2) R. pallidus Thaxter, on Lathrobium fulvipenne Grav., L. punctulatum Lee, L. angu- 



lare Lee, N. America. 



** Antheridia not arranged in definite series on the appendages. 

 Genus VII. Rhizomyces. Basal cell of the receptacle penetrating the host by rhizoidal 

 outgrowths ; sub-basal cell giving rise to a single simple appendage bearing unilaterally a single 

 series of branches, the basal cells of which bear antheridia. 



(1) R. ctenophorus Thaxter, on Diopsis thoracica Westw., Africa. 

 Genus VIII. Laboulbenia. Multicellular receptacle formed in part by the union of the base 

 of the appendage and the stalk-cells of the perithecium. Appendages arising beside the peri- 

 thecium usually from a black insertion cell. 



(1) L. anceps Peyritsch, on Platynus viduus Pz., Europe. 



(2) L. arcuata Thaxter, on Harpalus pennsylvanicus De G., N. America. 



(3) L. armillaris Berlese, on Antennophorus caput-carabis, S. America. 



