The Development of Geothallus tuberosus, 
Campbell. 
BV 
D. H. CAMPBELL, Ph.D. 
Professor of Botany in the Leland Stanford Junior University , California, U.S.A. 
With Plates XXIV and XXV. 
I N the spring of 1895 the writer received from San Diego 
specimens of a Liverwort which on examination proved 
to be so different from any described form, that it seemed 
necessary to establish a new genus to contain it. A pre- 
liminary account of the plant was therefore published 1 , in 
which the name Geothallus tuberosus was proposed for it. 
The first lot of specimens were sterile ; but later, through the 
kindness of Mrs. Katherine Brandegee, from whom the first 
lot had been received, fruiting plants were secured which 
proved conclusively that the plant represented a very low 
type of Hepatic, whose sporogonium was very much like that 
of Sphaerocarpus , a common Liverwort of the whole coast- 
region of California. 
When first received, the plants had about completed their 
season’s growth and were beginning to dry up. The thallus 
was partly buried in the light sandy earth in which they were 
growing, and they were quite overlooked at first. They 
were growing with plants of Ophioglossum nudicaule , and 
1 Campbell, A New Californian Liverwort, Botanical Gazette, Jan. 1896. 
[Annals of Botany, Vol. X. No. XL. December, 1896.] 
L 1 
