THAXTER. — LABOULBENIALES PARASITIC ON CHRYSOMELIDAE. 23 



Laboulbenia Bruchii (Speg.). 



Sphaleromyces Bruchii Speg., Cont. al Est. d. 1. Laboulbeniomycetas 

 Argentinas; Ann. d. Mus. Nat. d. Hist. Nat. de Buenos Aires, XXIII, 

 p. 195, with figure, 1912. 



This form, which is very common on various species of Lema in 

 Tropical America, has been referred to Sphaleromyces by Spegazzini. 

 Its structure, however, is that of a typical Laboulbenia, and the 

 number and arrangement of the cells of its receptacle are both normal. 

 Although the structure is sufficiently clear in younger individuals, 

 cells II and III usually become very deeply suffused, except along their 

 inner edges, and are indistinguishable from cell IV, the variable pro- 

 longation of which forms the curious spur-like termination regarded 

 by Spegazzini as a development from cell II, and as similar to that 

 which arises from the distal cell of the two-celled receptacle of Core- 

 thromyces, in which it is a development from this cell only. This 

 characteristic varies very greatly in different individuals of the present 

 species, the spur in many cases being but slightly developed, or at 

 least far less prominent than it is in the typical form represented by 

 the figures of Spegazzini. The species is a very striking and variable 

 one, closely allied to the three following forms which occur on the 

 same host genus, and in the characteristic development of cell IV 

 resembles L. producta of my second Monograph (Plate LXIV, fig. 13). 

 The longitudinal dehiscence of the perithecium, which is given by 

 Spegazzini as a distinguishing character of this species, must be 

 regarded as an accidental splitting, which is not infrequently seen in 

 dried material that has been taken from museum specimens and 

 suddenly swelled by mounting. 



Material has been examined from the following sources. No. 1643, 

 on Lema sp. Guatemala, (Kellerman) ; No. 1774, on L. Sallei Jac. 

 Mexico (Biologia Coll.); No. 1775, on L. Albini Lac, Mexico (Bio- 

 logia Coll.); No. 1776, on L. dimidiaticornis var., Mexico, (Biologia 

 Coll.); No. 2212, on L. gracilis Jac, Para, Brazil (Mann): Nos. 

 2476-2477, on several species of Lema, Port of Spain, Trinidad. 



Laboulbenia Papuana nov. sp. 



Receptacle short and subtriangular, the basal cell nearly hyaline, 

 except distally and along its posterior margin; short, abruptly 

 broader distally, subgeniculate ; its base clasped by a bluntly pointed 



