Ail increase in the number of individuals by the formation 

 of two new tubers in a growing season is theoretically possible. 

 Thomas (12: p. 290) says this is "quite a common occurrence," 

 though Cheeseman (4: p. 1033) says it is rare. A large 

 number (over 100) of Western Australian plants were recently 

 examined by Miss Sampson (11 : p. 317), who found they had 

 all formed but a single new tuber. It would seem that, in 

 Australia at any rate, the multiplication of individual plants 

 by the formation of more than one annual storage tuber is 

 uncommon. 



The exception mentioned above was a fertile plant with 

 5 leaves and 2 roots that had formed one tuber stalk, which 

 forked at the distal end, producing two tubers. This is 

 figured, and will be more fully 

 described should it prove of ana- 

 tomical interest (text fig. 2). 



At present the only known South 

 Australian station for Phylloglossum 

 Drummondii is National Park, 

 Belair. 



Habitat. 



It has not been found possible 

 to obtain much information as to 

 the conditions of growth of Isoetes 

 Drummondii in other Australian 

 States. The record made by Ewart 

 and Rees (6: p. 5) states that the 

 habitat was "in pools on summit, in 

 granite basins on bare rock," and 

 Professor Ewart has kindly fur- 

 nished the supplementary inform- 

 ation that -"it was completely sub- 

 merged in summer time." I have 

 not had an opportunity of examining 

 one of these specimens, but I grate- 

 fully acknowledge the kindness of 

 Professor Ewart in loaning me a 



specimen from the National Herb- mondii. Fertile plant pro- 

 arium, Victoria, collected in "sub- during two new tubers in 

 saline p. [places?], Little Desert, one growing season by « 

 t~„ t „~ xt -4--L z\t- -l. • >> mi birurcation or the distal 



Lowan, North-west Victoria. The end of the tuber gtalk 



megaspore measurements of this Camera lucida outline 



specimen agree with those from x3£. 



South Australia. The species may 



be said to be common in parts of the National Park, 



growing in damp sandy soils derived from decomposed 



Cambrian quartzites. The habitat and soil is similar at 



Fig. 2. 

 Phiilloglossum Drum- 



