RHODOPHYCEA, OR FLORIDEA 209 
valid generic type Chantransia. The species of 
Chantransia are mostly epiphytic and very minute, 
consisting of branching rows of cell-filaments spring- 
ing from a membranous base and terminating upwards 
as a rule in fine long hairs. The reproductive 
processes have been fully studied in Ch. corymbifera. 
When the carpogonium has been fertilised it begins 
to sprout on one side and to produce the gonimo- 
blast upwards. There is ultimately thus formed a 
naked corymbose fruit (cystocarp), the terminal cells 
producing the carpospores. The antheridia are in 
similar corymbose clusters. The so-called tetraspores 
remain undivided, are in fact monospores; but on 
germinating, as has been observed in Ch. secundata, 
the monospore first divides into four, and then very 
closely resembles a tetraspore. This division then 
proceeds in the same plane, thus giving rise to the 
membranous base of Chantransia, from which the 
erect filaments spring. 
In Nemalion the fertilised carpogonium bulges 
upwards, and the upper portion is divided off as a new 
cell from the free surface of which the gonimoblast 
springs. In this genus and in Helminthocladia, a 
kind of envelope of filaments arises from the carpo- 
gonial branch and adjacent cells. In Ziagora the 
thallus is slightly encrusted with carbonate of lime, 
but remains very slender and even viscid. It 
consists, as in Nemalion and Helminthora, of a 
number of united axial filaments, clothed with dense 
lateral branches at right angles to the axis. In all 
the genera, except Chantransia, the thallus is more 
or less gelatinous in consistence. 
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