Australasian Characeae. 



di. 



d2. 



Antherida and oogonia conjoined. 

 Bracts on all the nodes of the leaves 



Antheridia and oogonia separated, 

 oogonia, but not antherida, in the 



Braunii, Gmel. 

 { = coronata). 



fundus of the verticil 



- succinct a, A. Br., f. novicaUdonica, 

 Nordst. ined. 



suhnollusca, Nordst. 



h. Corticatae. Stem variously corticated. 



el. Haplostichae. Series of cortex cells 

 equal to the number of leaves. 



fl. Dioecious 



f2. Monoecious - - - - myriophylla, F. Miill., A. Br. 

 e2. Diplostichae. Series of cortex cells 

 double the number of leaves, 

 fl. Dioecious. 



gl. Both antheridia and oogonia in 



the fundus of the verticills - leptopitys, A. Br., and 



subsp. suhehracteata, Nordst. 



g2. Neither, antheridia nor oogonia 



in the fundus of the verticill 



(small, slender, stipules pressed 



against the verticill). 



hi. Unistipulatae. Stem with small 



papillae 



h2. Bistipulata. Stem more or less 

 spinescent 

 f2. Monoecious. 



mollusca, A. Br. 



- dichopitys, A. Br. 



il. Gymnophyllae. Leaves usually 

 naked. 



kl. Stipules large. 



U. Antheridia and oogonia on the 

 same node. Nucleus black 

 with many different forms, as: 

 aequistriata (subf. polyphylla), 

 f. tylacantha, v. duriuscula, 

 acanthopitys and trachypitys. 



12. Antheridia and oogonia on 

 different nodes of the same 

 leaf (verticil with 14-16 leaves) 



k2. Stipules small (nucleus black or 

 brown) . - - - . 



i2. Gymnopodes. Leaves usually 

 corticated, except the first, 

 lowest node ... - 



gymnopithys, A. Br. 



63. 



Triplostichae. Series of cortex cells 

 triple the number of leaves - 



Diplostephanae. Circle of stipules consisting 

 of a double (rarely triple) series of cells. 



11. Diplostichae. Series of cortex 

 cells double the number of leaves 



Griffi^thii, A. Br. 



Dnimmondii, A. Br. 



Hydropitys, A. Br. 

 (not seen in Australia). 



Muelleri, A. Br. 



