EUOSMOLEJEUNEA OPACA 139 
Stephani but feels compelled to follow the evidence drawn from the 
specimens themselves. 
Opinions have varied with regard to the systematic position of 
E. duriuscula. By Spruce it was first placed in Chezlo-L ejeunea, 
a disposition now accepted by Stephani and by Schiffner. Spruce 
afterwards transferred it to Zuosmolejeunca, thereby agreeing with 
an earlier view of Stephani. The plant agrees with Enosmolejeunea 
in its color and general habit, in its leaves and cell-structure and 
in its perianth. Its underleaves, however, are smaller than is 
usual in the genus and lack the basal cordations which normally 
occur. Since several species of Zuosmolejeunea with equally small 
underleaves have been described, this difference by itself should 
hardly suffice to exclude Æ. duriuscula. The species certainly has 
less in common with either Chetlolejeunea or Lejeunea proper than 
it has with Zuosmolejeunea. : 
E. duriuscula seems to be limited with us to the States border- 
ing the Gulf of Mexico. The specimens from Kirkville, New York, 
quoted by\Underwood as ZL. Austini * are referable to 0 
cavifolia. These specimens were determined by Spruce, who had 
apparently been misled by plants incorrectly referred to Z. Austini. 
In addition to Z. cavifolia, no fewer than four of our other Le- 
jeuneae have been found in herbaria incorrectly determined as Z. 
Austini. Our only species, however, which it at all closely re- 
sembles is Euosmolejeunea opaca, under which the differential char- 
acters will be noted. 
8. EUOSMOLEJEUNEA OPACA (Gottsche) Steph. 
PLATE 19, Fiss. 1-11 
Lejeunea opaca Gottsche ; G. L. & N. Syn. Hep. 362. 1845. 
Lejeunea (Omphalanthus ?) Mohri Aust. Bull. Torrey Club, 
052001875 
i Lejeunea (Euosmo- Lejeunea) laxiuscula ne Hep. Amaz. et 
And. 244. 1884. 
Lejeunea (Euosmo-Lejeunea) opaca Steph. Hedwigia, 29: 79. 
1890. 
Euosmolejeunea opaca Steph. Bihang Svenska. Vet.-Akad. 
Handl. 23°: 23. Bon hs d ur e pO I 
TU mE Torrey Clob, 19: 299. 1892. : 
