| BRIEFER AKTICLES 273 
ty Gottsche in the paper already referred to. Leitgeb* in his great 
 workupon the Hepaticae made some additions to Gottsche’s descrip- 
tim and corrected his error as to the origin of the archegonia. Both 
ofthese observers studied the female plant only, but in the last part 
itthis work Leitgeb describes the male plant of what he considered 
tdistinet species, to which he gave the name I. dilatata, The speci- 
mens came from New Zealand and were supposed to be a species, of 
Dumortiera, which Monoclea resembles very closely in general habit. 
Finally Ruge* has added materially to our knowledge of the plant, 
‘Specially as regards the development of the reproductive organs. 
While Gottsche and Leitgeb both recognized the obvious resem- 
‘hace of the thallus of Monoclea to that of Dumortiera, they concluded 
that the complete absence of the characteristic lacunae of the marchan- 
‘aceous thallus in the former forbade its being placed in the Mar- 
Cantiaceze, and that its nearest affinity was with the thallose Junger- 
Naniacee like Pellia and Pallavicinia. 
careful examination of the material collected by me last summer, 
sig a a study of the observations made by Leitgeb and Ruge, have 
eed me that the genus should be removed from the Junger- 
miMniaceze to the Marchantiacez with which it much more closely 
- The form of the thallus and the character of the apical cell 
| be omtized by Leitgeb as marchantiaceous, but as the air-cham- 
. ig quite absent he concluded that this resemblance was purely 
oo While admitting the absence of lacunae in some forms of 
Dat a he claimed that these were always formed in the youngest 
ae thallus and were destroyed later. However, a caretul exam- 
by the writer? of D. trichocephala showed that in this species 
“= Were 
tha, S 
hak 
’ tit, very brief duration. These, however, correspond in origin 
Mon BOF the ordinary types, and simply remain andesiEe 
°elea, unlike any of the Jungermanniacez, has two sorts © 
"Ot-hairs th: | 
ue 'S, thin-walled ones like those of the latter, and thick-walled 
EIT : : 
'R hs Untersuchungen iiber die Lebermoose 3 : 62- 5 Op. cit- 6: 13% 
j . Lebermoose- 
i *: +. 
lags ue zur Kenntniss der Vegetationsorgane der 
279. 
"Campp : 
*BELL, D H 
t, D. H., Mosses and Ferns 49. 1895. 
