DR. D. H. SCOTT ON BOTRYCHIOXYLON PARADOXUM. 987 
7. The adventitious roots are diarch and freely branched. They formed a periderm 
and sometimes secondary wood. 
8. The affinities of Botrychiorylon appear to be closest with the genus Meta- 
clepsydropsis; in the stem of the latter, however, secondary wood is only formed in 
exeptional cases. 
9. Botrychiorylon shows close analogies with Botrychium, in which also internal 
xylem sometimes occurs. The affinity of the Zygopteridee generally with the Ophio- 
glossaceze is confirmed. 
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