4 
MONOGRAPn OF THE LABOULBENIACE^. 243 
« 
Total number of species known to exist 168 
a 
u 
a 
a Ci 
" " " described 152 
" u Xorth American species described 124 
u 44 ^Tqj.j^i^ American species known • . • . • 130 
^' Enroi»ean species 19 
4C 
" '^ African species 
44 Cb 
" Soutli American species 
44 
"•' " Asiatic species 
4h ki 
" Australian species 
14 
6 
6 
2 
^ 
Common to North America and Europe. — Chitonomyces paradoxus^ lihadinomj/ccs palUJuSy 
Lahoulhenia elongata^ L, cristata^ L. Gyrinidarumy L. luxurians^ L. NchricSy L. mhterranea^ L. 
vulgaris. 
Common to North America and South America. — Lahoulhenhi Gueriali^ L. variahilu^ L. 
polypliaga. 
Common to Nortli America and Africa. — Lahoidbcnia Catascopi^ L. pohjphaga^ L.eluiigaia (T), 
Common to South America and Africa. — Lahoulhenia Pheropfiophiy i, polyphaga. 
Common to Africa and Asia (Japan). — Lahoulhenia proliferans. 
Common to North America, South America, and Africa. — L. polyphaga. 
Common to North America, Africa, Europe, and Asia. — Lahoulhenia elougata. 
Common to North America, Europe, and Asia (?). — Lahoulhenia vulgaris. 
In regard to the distribution of single species in a given continent no data are 
available in any case except that of North America^ where a wide distribution of given 
species is indicated. The common Lahoulhenia Nchrice^ which is also known to occur in 
Europe, is found in America from Maine to Virginia, and west to Wasliington. extend- 
ing northward to Alaska and the Aleutian islands. Lahoulhenia cristata is another 
instance of a European form wliich is found in this country from Maine to 
Nicaragua, and several examples might be mentioned of species found throughout the 
United States and Mexico. The writer lias unfortunately had no opportunity of col- 
lecting Laboulbeniacea3 on their living hosts outside of New England, and it is only 
in this limited territory that an approximate knowledge of their local di.^tribution has 
been obtained; yet in general it may be safely assnmed that the diflcrent species have 
a range practically coincident with that of their usual hosts. The occurrence of more 
or less cosmopolitan forms, like some of those mentioned above, which are doubtless 
more numerous than our present knowledge would indicate, has a certain interest 
when we consider that the possibilities of dissemination are so restricted as is neces- 
sarily the case where, as in the present instance, direct transfer from one living host 
to another is an essential factor in the perpetuation of the species. Of the more local 
occurrence of the Laboulbeniacea3 nothing furtlier need be said at present, since, as 
has just been mentioned, it coincides with that of the special hosts of the group, which 
will be presently referred to. 
I 
