334 Campbell.—Studies on some East Indian Hepaticae . 
for some reason no fertilized archegonia or embryos were present in the 
material examined. 
Dumortiera calcicola , sp. nov. 
Thallus slender, olivaceous or brownish, 4-5 cm. in length by 4-5 mm. 
in width. Sterile shoots mostly dichotomous ; fertile branches, except the 
primary ones, arising as adventitious shoots near the apex of the primary 
branch. Air-chambers evident; dorsal papillate cells rather numerous, but 
less so than in D. velutina . Ventral scales narrowly spatulate, incon¬ 
spicuous ; rhizoids numerous ; several (5-6) receptacles formed in succession 
on a series of terminal adventitious shoots. Antheridial receptacle sessile, 
often distinctly 5-6 lobed, about 2 mm. in diameter. Archegonial receptacle 
sessile, similar in form and size to the male receptacle, but less evidently 
lobed. Sporophyte unknown. 
On limestone soil ; Bidi Caves, Bau; Sarawak, Borneo, Feb. 1913. 
Wiesnerella denudata (Mitten), St. 
The genus Wiesnerella contains a single species, W. denudata (Mitten), 
St., 1 which has been reported from four widely separated regions, viz. 
Java, the Himalayas, Japan, and Hawaii. 2 Schiffner gave the name 
Wiesiierella Javanica to a Liverwort collected on Mt. Gedeh in Western 
Java. Stephani considers this to be identical with Dumortiera denudata , 
Mitten, originally described from the Himalayan region. Schiffner 3 has 
given a clear diagnosis of the plant, but, so far as the writer is aware, did 
not study in detail the structure of the reproductive organs and sporophyte. 
The material upon which the following account is based was collected 
by the writer near Tjibodas, on Mt. Gedeh, the locality from which 
Schiffner* specimens came. 
Wiesnerella (PI. IX, Fig. 13) in size is about the same as Dumor¬ 
tiera velutina , and in general habit is not unlike that species ; but the colour 
is quite different, being a silvery green, quite different from the rich velvety 
green of D. velutina. This difference is due to the presence in Wiesjierella 
of a definite epidermis, with regular pores opening into perfectly developed 
air-chambers like those in most other Marchantiaceae. These air-chambers 
at once distinguish Wiesnerella from the evidently nearly related genus 
Dumortiera. 
A vertical section of the apex of a sterile branch (PL IX, Figs. 16, 17) 
shows much the same structure as that found in Targionia or Fegatella . 
The wedge-shaped apical cell appears in this view as a triangle with alternate 
dorsal and ventral segments cut off from it. As usual, the growth in the 
dorsal region of the thallus is more active than in the tissue derived from the 
1 IV. Javanica , Schiffner. 2 Stephani: loc. cit., p. 381. 
3 Schiffner; loc. cit., p. 2. 
