324 



XXIII. REPRODUCTION OF FUNGI. 



consists of branched hyphae, divided by numerous partition walls, 

 The contents directly visible are finely granular protoplasm and 

 small vacuoles. Individual threads, not distinguishable from other 



mycelial threads, have developed into 

 fruiting branches (gonidiophores). 

 At their apex they produce a whorl 

 of short branches, which branches 

 (Fig. 116, s') on their part either 

 bear directly whorls of sterigmata 

 (bst), or each one again bears a 

 whorl of shorter branches, and then 

 these bear the whorls of sterigmata. 

 This branching gives to the gonidio- 

 phore the appearance of a brush. 

 Commonly other lateral branches, 

 which arise just under a partition 

 wall of the primary gonidiophore (as. 

 in the right hand of the figure), come 

 up laterally to this terminal brush, 

 and form secondary gonidiophores. 

 The sterigmata, as sufficiently strong 

 magnification shows, are cylindrical, 

 prolonged at their end to a finer pro- 

 jection (st). This swells spherically 

 at its apex, and forms a quickly- 

 growing gonidium. Under the first 

 gonidium a second swelling soon 

 appears, which becomes a gonidium, 

 and so on ; so that chains of gonidia 

 arise, the terminal one being the 

 oldest. The uppermost gonidia of 

 the chain are thrown off, while new 

 ones are thrust outwards from below 7 . 

 Tufts of Penicillium, fixed with 



oi branches (s' and s"), sterigmata a i co h o l, stain very well with very 

 (st), and gonidia ; nuclei visible. . , J 



From an alcohol-haematoxylin pre- dilute haematoxylin, by which it can 



paration(xi be determined that in the cells of 



the mycelium and the fruiting branch numerous nuclei are pre- 

 sent. The nuclei are very small, so that they require strong 

 magnification. They are elongated in the longitudinal direction 

 of the cell, and joined together by fine plasma threads. In long 



FIG. 116. Penicillium crustace- 

 um, fruiting branches with verticils 



