PAPERS ON BOTANY 181 



seems to be a predominance of rod-shaped spores over 

 other shapes. 



Tvrenty-three of the fifty species from Legnminosae 

 are rod-shaped, fourteen are filiform. It will also be 

 noted that a large part of them are septate. The vari- 

 ation in spore length is great, and ranges from 10 to 120 

 mu. 



Most of the species in the "Umbelliferae" gronp may 

 be inclnded within the limits of spore length of 25-50 mu, 

 and it is probable that many of these are s^Tiomous with 

 S. petroselinum, var. apii, the common form on celery. 



There is nothing of special importance connected with 

 the species on Labiatae except that there is a general 

 absence of septation. 



Of the group from the Eosaceae, thirteen species have 

 been described from Prunus alone. This amoimts to 25% 

 of the species from this family. 



Species from the Caryophyllaceae present some inter- 

 esting features. First, nearly all spores seem to be rod- 

 shaped; second, there are few continuous spores. 



In the group from Cruciferae, one group on Sysim- 

 brium from Servia with a spore length of 19-62 mu, may 

 be considered as including 16 of the 22 species from this 

 family. 



Nearly one-half of the species from the family Solon- 

 aceae are reported from Solanum. 



Approaching the tables from the standpoint of mor- 

 phology alone, there will be noted a general similarity 

 between species with given spore lengths, as regards sep- 

 tation, spore shape, locality, etc. Thus on page 1 of the 

 general tables, we see six species with spore lengths of 

 10-12 mu. all reported from Italy ^\-ith the exception of 

 one from France. The diameters of the spores are very 

 similar and the septation is definite. All have rod-shaped 

 spores and in all cases where the fact is mentioned the 

 spores are curved. The largest groups of this kind are 

 those with spore measurements lying between 20 and 25 

 mu. and 20 and 30 mu. Each of these contain over thirty 

 species and probably include many identical forms. 



