[From the ButteTin or tHE Torrey Botanicar Ciup, 47: 1-8, 31 J 1920.] 
Observations on monosporangial discs in the genus Liagora 
MARSHALL A. HOWE 
(WITH PLATE I AND FIVE TEXT-FIGURES) 
The genus Liagora is a group of-marine red algae of the family 
Nemalionaceae (Helminthocladiaceae). The species are con- 
fined to the warmer seas, where they show a preference for water 
that is normally agitated, ranging, however, from between the 
tide-lines on surf-beaten rocks down to a depth of at least one 
hundred feet. In the West Indian region, including Bermuda 
and southern Florida, the genus is represented by nine or ten 
species and one species is known to occur on the Californian 
coast. With the exception of one species, recently described from 
Bermuda by Collins & Hervey,* and one from the Mediterranean 
Sea, the plant body i is more or less calcified, the amount of the 
lime and the way in which it is deposited being more or less char- 
acteristic of the various species. Under the compound micro- 
Scope the thallus is seen to be of an obviously filamentous struc- 
ture, both the structure and the often lubrieous character of the 
plants when living sometimes calling to mind their fresh-water _ 
relatives of the genus Batrachospermum. 
Most of the species of Liagora are consistently dioicous, others 
are consistently monoicous—characters that hitherto have been 
rarely ascertained or mentioned in the describing of species, 
Probably because the antheridia are in some species very incon- 
spicuous. The plants rarely seem to be sterile. Antheridia, 
SPICDOUR, no be src, eee 
* Proc. Am. Acad. 53: 100. 1927. 
