6io Osborn. —Lateral Roots of Amyelon radicans , Will., 
Summary. 
1. A redescription is given of the tufts of short much-branched roots 
borne at intervals on Amyelon radicans^ and originally described by 
Williamson in 1874. 
2. The lateral roots are found to have a wide cortex divisible into two 
regions. 
3. The inner cortex of all specimens examined is found to contain, 
more or less abundantly, dark cells, many of which on examination show 
evident fungal hyphae. 
4. The fungus occurs in knots of apparently non-septate hyphae. 
These bear in some cases terminal vesicles. There is no trace of any spore- 
formation. 
5. The relationship of the fungus to Amyelon is discussed, and the 
conclusion arrived at that it was of the nature of a symbiosis. 
6 . Cordaites was probably a tree, inhabiting saline swamps, and having 
bunches of coralline rootlets on its roots, such as are known to occur in 
many recent plants growing under similar conditions. 
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