Studies on some East Indian Hepatieae. 
BY 
D. H. CAMPBELL. 
With Plates VIII and IX and ten Figures in the Text? 
Dumortiera. 
HE genus Dumortiera is common throughout the humid tropics of 
A both hemispheres, and extends into the warm temperate regions as 
well. Thus D . hirsnta occurs in the British Isles, Japan, and the South- 
Eastern United States. 
The anatomy of the thallus has been pretty completely investigated 
and will not be dwelt upon at length. 1 * 2 Very little, however, has been done 
upon the development of the reproductive organs and sporophyte. 
Collections have been made by the writer in various parts of the Indo- 
Malayan region. These were mostly of the widely distributed species, 
D . trichocephala , Hook., but the much more local species, D . velutina , 
Schiffn., was also collected, as well as what appears to be an undescribed 
species from Sarawak in Borneo. 
From a study of these collections it was possible to secure a fairly 
satisfactory series of preparations showing the most important points in the 
development of the sexual organs and sporophyte. 
Stephani 3 recognizes but three species of the genus, of which D. tricho¬ 
cephala is widely distributed throughout the Indo-Malayan region and 
Oceanica, while D. hirsnta (Sw.), R. Bl., is widespread in both hemispheres. 
The very distinct D. velutina , Schiffn., is known only from Java and Sumatra. 
Immature specimens of Dttmortiera , collected by the writer in Hawaii 
during the past summer, may possibly belong to this species. 
In 1892 the writer collected in Hawaii sterile specimens of a Dumortiera 
which was identified by the late Professor L. M. Underwood as D. tricho¬ 
cephala? The thallus in this form is quite destitute of even the rudiments 
of air-chambers, thus differing from all the other species that have been 
1 Leitgeb : Untersuchungen iiber die Lebermoose, vi. Graz, 1881. 
Ernst, A.: Untersuchungen iiber Entwicklung, Bau und Verteilung der Inflorescenzen von 
Dumortiera . Ann. Jardin Bot. Buitenzorg, 2 e ser., vii, 1908, pp. 153-223. 
2 Stephani, F. : Species Hepaticarum. Bull. L’Herbier Boissier, vii, 1899, pp. 222-5. 
* See Campbell: Mosses and Ferns, 2nd edition, p. 49. 
(Annals of Botany, Vol. XXXII. No. CXXVII. July, 1918.] 
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