HISTORICAL 117 
Irish hepaticae, includes interesting notes on some of the Lejeu- 
neae in American exsiccatae. The most important of these are 
the following: Zejeunea ulicina, of Europe, is accredited to North 
America; Z. parvula (the Jungermannia parvula of Drummond's 
collection) is recognized as a species, and Sullivant's L. minutissima 
is reduced to it as a synonym; the American specimens of L. ser- 
Pyllifolia are all referred to the new var. Americana Lindb.; L. 
Sullivantiae Aust. is given the new name Z. Austini Lindb., on 
account of the previously described Z. Sullivantii Gottsche. The 
evidence that Microlejeunea ulicina (Tayl.) occurs in North Amer- 
ica does not seem to be conclusive. Lejeunea parvula and L. Sul- 
livantiae have already been commented upon. Lindberg’s var. 
Americana is a composite, and, while it includes the Z. Americana 
of the present paper, it includes also typical Z. cavıfolia. 
In 1884 Spruce, in his important work on South American 
hepaticae, accredits the rare European Z. diversiloba Spruce to 
North America. He apparently refers to this species the speci- 
mens which Sullivant called ۲۰ cucullata, although this is not defi- 
nitely stated. Three years afterwards Spruce referred Sullivant's 
specimens somewhat doubtfully to Z. /ucens Tayl. 
The numerous papers on hepaticae by Underwood contain fre- 
quent references to the Lejeuneae. In his preliminary list of 
North American species, published in 1882, fourteen species of 
Lejeuneae are noted. In his Descriptive Catalogue of 1884, de- 
scriptions are given of these fourteen species and of four others 
omitted from the earlier list. All of these species had been pre- 
viously recorded. In the sixth edition of Gray's Manual, pub- 
lished in 1890, Underwood described the hepaticae, and it is inter- 
esting to note that the four Lejeuneae which he there recognizes 
are the same ones which Sullivant described in the first edition of 
the Manual, forty-two years before. In the same year Underwood 
published a description of Leyeunea Macount Spruce, and Pearson, 
a plate of L. Biddlecomiae Aust., accompanied by descriptive notes. 
Both of these species belong to the genus Cololejeunea. Two years 
later Underwood recorded another Cololejeunea, the European Le 
Rossettiana Massal., but there seems to be no very adequate evidence 
that this species has been collected in America. 
The last published list of North American Lejeuneae is that of 
