LA BO ULBENIALES 



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held in place. From this enlargement a single simple rhizoid in T. 

 Lipeuri, or many branching ones in T. histophtorus, make their way into 

 the body substance. The sub-basal cell, by the formation of tangential 

 walls, separates a variable number of small cells which may multiply 

 variously by division, even organizing definite short axes with growing 

 points in T. Laemobothrii; and, as a result, the original cell may become 

 more or less corticated. The process is more definite in T. Lipeuri in 

 which these cells are comparatively larger and more regular, developing 

 sidewise to form a pulvinate series. 



Fig. 260. — Polyandromyces Coptosomalis. 1 to 6. Development of male. 10 to 12. 

 Mature females. 13 to 15. Male and two females of var. minor. Nycteromyces streblidi- 

 nus. 7. Mature male. 8. Young female. 9. Mature female. (After Thaxter, 1924.) 



From a variable number of these cells, single-stalked perithecia arise 

 in the female or antheridia in the male; of which there may be from 

 one or two to more than a dozen in a single individual. The perithecia 

 and antheridia closely resemble those of Dimeromyces, the walls of the 

 basal cells in the former being absorbed at an early period so that the 

 cavity of the highly developed stalk cell becomes continuous with that 

 of the ascigerous cavity. In male individuals the cortication is usually 

 much less complicated; and the cells which give rise to the stalked, com- 

 pound antheridia much like those of Dimeromyces may be separated 

 directly from the sub-basal cell without secondary division, as in T. 



