FOUR-LOBED SPORE MOTHER CELLS IN CATHARINEA 457 
Pellia^ or Symphyogyna.^ An occasional cell (as in figure 2, C) 
might be described as tetrahedral rather than lobed; the one shown 
in figure 2, C, however, could be seen in other optical sections 
than the one drawn to be really somewhat more distinctly 
Fig. I. Groups of spore mother cells from four capsules of Catharinea angustata 
From living material. 
lobed than this figure would suggest. The shapes of these cells in 
Catharinea are not dissimilar to those of the spore mother cells of 
Fossombronia.^ Indeed, among the Jungermanniales, in which (if 
the Sphaerocarpaceae and Riellaceae be excluded) the lobing of the 
spore mother cells seems to be a universal character, the depth of the 
1 Farmer, J. B. On spore-formation and nuclear division in Hepaticae. Annals 
of Botany 9: 469-523. 1895. 
2 McCormick, Florence A, A study of Symphyogyna aspera. Bot. Gaz. 58: 
401-418. 1914. 
^ Farmer, J. B. Loc. cit. 
Humphrey, H. B. The development of Fossomhronia longiseta Aust. Annals 
of Botany 20: 83-108. 1906. 
