﻿154 BOTANICAL GAZETTE [march 



mycelium of rather slender septate hyphae from which the fer- 

 tile hypha usually arises as a lateral branch, of relatively large 

 diameter, which becomes abruptly differentiated. As this fertile 

 hypha commences to rise above the substratum, a number of 

 vegetative hyphae, or branches from them, grow toward it; and, 

 as it elongates, apply themselves closely to its surface, growing 

 upward as it develops and more or less completely corticating 

 it, except in the region of its free extremity. When the fertile 

 hypha has attained its full height the free tip, ceasing to elon- 

 gate, becomes abruptly swollen, forming a head much as in 

 Aspergillus {jig. 2), the whole surface of which soon becomes 

 papillate with young sporiferous branches {fig- j)- The corti- 

 cating hyphae meanwhile, being enabled to overtake the head, 

 apply themselves closely to its surface and begin to push 

 between the young sporiferous branches, by which they are soon 

 more or less completely concealed. At the same time, also, 

 they begin to branch more or less copiously, and the extremi- 

 ties of these branches, growing outward with the sporophores, 

 extend rapidly beyond them {Jig. 5), and eventually form the radi- 

 ating septate bristles above referred to. Their development, 

 however, is not confined to mere elongation; since, just below two 

 or sometimes three of the lowest septa, they give rise to whorls of 

 lateral branches, which, growing tangentially, by branching and 

 intertwining eventually form an envelope like basket-work that 

 incloses the sporogenous branches completely, and through 

 which the bristle-like hyphae appear to project. The sporogen- 

 ous hyphae in the meantime branch successively in an irregu- 

 larly umbellate fashion, the branchlets becoming more numerous 

 as the process is repeated. The basal cells and those of the 

 main branches become greatly enlarged, closely compacted, and 

 more or less adherent, so that they are with difficulty crushed 

 apart; while the ultimate branchlets of the third or fourth order 

 bear an irregular umbel of sporiferous branchlets, from the tips 

 of which the minute oval spores are successively abjointed 



The head, which strongly suggests the pseudoperithecium, if 

 it may so be termed, of the more highly differentiated species of 



