Evans: HEPATICAE OF PurrTo Rico 219 
The present species and the following, D. Rudolphiana, have 
been so much confused that a brief account of their history may not 
be out of place. Jungermannia unidentata was originally described 
from a specimen in the Hooker herbarium, collected on the 
island of St. Vincent. A portion of this original material is pre- 
served at Kew, and although it is perfectly sterile it agrees so 
closely with the other plants cited above that there can be but 
little doubt that they represent the same species. A similar 
specimen from the Lehmann herbarium is in the Montagne 
herbarium at Paris. In 1845 Montagne reported D. unidentata 
from Cuba, his record being based on specimens collected by 
Ramon de la Sagra.* He also published figures of these specimens, 
and since his time D. unidentata has been listed from a number of 
localities in tropical and subtropical America, many of the deter- 
minations being apparently based on these figures. A careful 
study of Montagne’s specimens, however, has shown that the 
Cuban plant is not the same as the type specimen in the Hooker 
herbarium, and that some of the published records for the species 
are therefore incorrect, a fact which the writer has already noted 
elsewhere.t The Cuban plant, however, does not represent an 
undescribed species. It agrees closely with D. Rudolphiana, and 
the same thing is true of some of the other specimens that have 
been referred to D. unidentata. 
In the opinion of Spruce, t D. unidentata alent to be considered 
as a variety of D. pellucida, but there are many reasons for regard- 
ing them as distinct species, in spite of the fact that both are 
dioicous, D. unidentata is a more robust plant than D. pellucida, 
It grows normally on bark and not on leaves, it is much less 
Closely @ppressed to the substratum, its leaves always lack hyaline 
borders, and the leaf cells usually show distinct local thickenings 
im their walls. The underleaves, too, present a very different 
The divisions spread obliquely, forming a distinct 
being acuminate. In the involucre the bracteole is much less deeply 
lucida, and the lobes are consequently broader 
* 
: . Ramon de la Sagra, Hist. Fis. Pol. y Natur. Cuba 9: 478. pl. 19. f. 2. 1845. 
‘iy Torrey Club 38: 207. 1or1r. 
Pp. Amaz. et And. 302. 1884. 
