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tonema originale«! only from the axillary cells, in other 

 cases from the various surface cells of the internode. The 

 axillary shoots in one case showed a tendeney to marked 

 apical origin (Mnium). In the other cases the distribution 

 was quite general. 



10. The buds originated from Mnium leaves and Fissidens 

 stems without the intervention of a protonema. When of 

 protonema origin, they were either modifications of lateral 

 protonema or rhizoid branches. or direct modifications of the 

 main axes. The tendeney of protonema to produce rhizoids 

 was not as great as the tendeney of rhizoids to produce 

 protonema. 



11. The upper temperature limit for regeneration from 

 the laves investigated varied from 24 to 32° C. Protonema 

 were grown in 1 and 2°/ Solutions of KN0 3 . Drying for a 

 considerable length of time did not alter the power of the 

 leaf to produce protonema. 



