43 2 



BOTANICAL GAZETTE 



[jUXE 



examination. Female plants bearing mature cystocarps can readily 

 be distinguished from the male and tetrasporic plants because the 

 cystocarps form protrusions in the wall of the thallus (figs. 1-3). 



Fig. 7. — Tetrasporic plant showing large number of much twisted branches; X o . 4 



The ends of the majority of plants collected in June and July were 

 considerably frayed out (figs. 1, 3, 4, 6). Since growth is apical, 

 the branches cannot increase greatly in length after the fraying 

 has begun. 



