THAXTER. — MONOGRAPH OF THE LABOtJLBENtAC) E. Ill 
Laboulbenia gibbifera Tlmxter. Plate LXVI, fig. I. 
Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 17!>. Ivc, 1SW. 
Perithecium free or nearly so, somewhat narrower than in L. Dercyli, the ajux narro\v< r and man 
abruptly distinguished, the lips distinct, turned slightly inward; an external outgrowth just below Hie 
blackened tip, which it may exceed in length, forming a free protuberance straight or bent side\ >v or 
inward, its apex evenly rounded or slightly inflated, its outer margin continuous with the nearly straight 
margin of the perithecium. Cells I and II of the receptacle faintly punctate, relatively long and stout, 
nearly isodiametric; cell II about twice as long, distally nearly as broad as the portion of the receptacle 
above it comprising cells III and VI, which are about equal in length; the latter extending obliquely 
somewhat lower but little higher than the former, and much narrower; the region of i 11 Y moft 
deeply suffused and distinctly punctate with blackish brown points, the undiffenn tilted insert ion -cell 
pushed out by the enlargement of cells IV and V. Appendages consisting of a number of prominently 
projecting basal cells, originating in part from the proliferation of cell V, which bear branches terminal!; 
and unilaterally, distinguished by blackened septa; the branches once to twice branched, their basal 
portion slightly suffused and with blackened oblique septa; the distal portion quite hvalii . Perithecium 
150-167 X 50 /i. Total length to tip of perithecium 400 i:>0 n\ to insertion-cell 275 :V\{)jl Appendag 
150 fi. 
T of f^/n.^nn ipnphrinijbmf\. Hnnp ('nil. No. 328. Para: Bril. Mus. No. 
IOSUS 
586, "S. America." Inferior surface of thorax and prothorax Dear base of two anterior pairs of leg 
Although this form is distinguished from L. Dercyli, with which it was associated on the san.. !,.. i. 
by the peculiar outgrowth from its perithecium, by the arrangement of the distal cells of its reoeptach 
and by the multiplication of its appendages through the proliferation of cell V, it may prove only a variety 
The curious perithecial outgrowth, however, is certainly not a structure which develops at late maturity; 
it appears well developed in the youngest perithecia; and in the sufficiently abundant material 
available of both species, there are no transitional conditions. It should nev rthelcss be pointed out 
that a similar outgrowth occurs in some specimens of the very variable L. I olyi 
figs. 1-3) but in this case a variety of intermediate conditions occurs. As in the ca of /,. Dm //. the 
since 
mud 
b< ! 
of L. variabilis. 
Laboulbenia variabilis Thaxter. 
This species appears to be absolutely confined to the western hemisphere, although it extends through- 
out the two continents. It is a very common and extremely variable form and OCCWS M a great variety 
of hosts. Through the courtesy of Dr. Horn of Berlin I have b< " ' '"" 
(HI tWM 
species 
pect 
the first members of the family which have thus far been seen on any member of die ( K-nnl.-h.ia-. I h 
variations of the species in general are associated with rather extreme variations m sue and [coloration 
and in the variable proliferation of the cells of the receptacle adjoining the inser,m.w-,ll which give rise 
to a variable number of appendicular cells. The following is a partial list of the addition*] material o< 
this species which has been examined since the publication of my Monograph. 
I 
British Museum, No. 628, on Platyma caiullrolf 
can u.s- did., Mexico; No. 584 on 
Hope 
s,,, "New York"; No. 337 on an undetemiDed caral.id from Yalparatso, Chile; »•*" ^"^ 
868 on Omophron American urn Dej., N. Aim 
fulgtdipenn 
ouo on uiiiituiirvii .imt'i (curium isi ., ^. ^"'^ a*w— , -•-• *~ - /r ,r • -L/^-^ 
No. 927 on OMM. G;uuU tt c,n Chand, Tuba. U. S. National Musenm Na 21, on "*'""•'' 
chrous Chaud., Central America; on Tetracha Hor„i Ro*. and T. frig* Klg., buador, „c 
from Dr. W. Horn of Berlin. 
