THE LYCOPODS (CLUBMOSSES) 



brought back, which was shortly reduced to a single plant by inadvertence, thereby pro- 

 viding too scanty a basis for comparison. Fig. 255, on the other hand, shows an old pot 

 plant from the Lizard (right) growing beside anold pot plant from Morocco (left) provided 



I 



Fig. 257. Prothallus of Isoetes hystrix Durieu from a glycerine jelly mount, a. Germinated megaspore 

 showing rhizoids and detached spore coat (inset), x 50. b. Rhizoids enlarged x 500. 



some years before by Professor T. G. B. Osborn. Two specimens from Morocco were kept 

 alive in Manchester for many years by means of the cultural treatment described above, 

 and both differed strikingly and constantly from the British plants both in stature and 



258 



