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BOOK-NOTES, NEWS, ¢e. 
Ar the meeting of the Linnean Society on December 17th, 1908, 
Mr. W. C. Worsdell exhibited living specimens of various forms of 
Selaginella, and remarked that in Selaginella inequalifolia Spring, 
S. Willdenovia Baker, S. canaliculata Baker, S. repens Spring, 
place shows that the rhizophore has the morphological character 
of a shoot, as there is clearly but a single organ here concerned, 
definite place of origin, are all in favour of their shoot-nature. 
Transitions occur between the normal rhizophore and the extreme 
leafy form. 
organs intermediate between shoot and root can exist in nature. 
At the same meeting Mr. George Massee exhibited preserved 
specimens and lantern-slides of the “ Black Scab” of potatoes. 
During the past few years this disease, caused by a parasitic 
fungus, has assumed the proportions of an epidemic in various 
spore as a sphere, from which the zoospores escape in an active 
condition, indicate that the parasite belongs to the old and well- 
known genus Synchytrum. hat happens to the zoospores after 
