102 JUNGERMANNIACEAE 
what abruptly contracted, at first crenulate-denticulate mouth: 
sporogonium unknown. 
In ditches, Mt. Dana, alt. about 3100 m. (Dr. Henry N. Bolan- 
der, September, 1866). 
Jungermannia Danicola is very closely allied to the Junger- 
mannia amplexicaulis Dumort. (J. tersa Nees) of Europe. It dif 
fers, however, in several more or less significant particulars and had 
best be considered distinct, at least until better known. We have 
been unable to find either perianth or antheridia in that portion of 
the type material preserved in the Gray Herbarium, and have 
drawn our brief description of these parts from Dr. Gottsches 
figures. What we have seen of the original material consists 
mostly of slender and distant-leaved sterile shoots ; these, judging 
from the stouter stems which sometimes occur and which Dr. 
Gottsche sketched, probably do not fairly represent the species. 
From Jungermannia amplexicaulis, the Mt. Dana plant seems to 
differ in the dark brown color, the smaller size, the apparently 
prostrate (possibly ascending) stems, the smaller rather more dis- 
tant, more translucent leaves, and the less differentiated marginal 
cells. The two antheridia figured by Dr. Gottsche occupy the ах! 
of the fourth leaf below the perianth, counting on one side only. 
Jungermannia amplexicaulis ( J. tersa) is described by Nees, Lim- 
Pricht, and Stephani as dioicous, but Lindberg (Kongl. Sv. Vet 
Akad. Handl. 23°: 39. 1889) states that it is paroicous. As rep- 
resented in Jack, Leiner, and Stizenberger, Kryptogamen Badens, 
es 873 бап с, the species is certainly paroicous, it being no | 
difficult to demonstrate collapsed antheridia with their still рег 
sistent stalks, intermingled with a few paraphyses of various forms, 
in the slightly saccate bases of the 9 bracts. In Gottsche 21 
Rabenhorst, Hep. Eur. nos. 359 and 511, we find paraphyses™ 
es 2. of the 9 bracts, but detect по unquestionable antheridial 
"е8. Тһе occurrence of antheridia in the position figured 
Gottsche in Jungermannia Danicola suggests the possibility that 
they may occur also nearer the archegonia. 
The perianth of Jungermannia amplexicaulis is when yon 
rather abruptly contracted at the apex to form a small subtubulos 
mouth. Dr. Gottsche’s figure of a very young perianth of /. D m 
cola shows no appreciable contraction but it would appear that this 
