296 



PART III. THE CLASSIFICATION OF PLANTS. 



Aspergillus davatus, Botrytis Bassii, species of Isaria, Cladosporium 

 Herbarum, etc.). 



The Reproductive Organs of the Gametophyte are asexual and 

 sexual. 



The asexual organs are gonidiophores, either simple or compound 

 (see Figs. 205, 211), branched or unbranched ; the gonidia are 

 formed by abstraction from short tubular outgrowths of the un- 

 branched, or of the terminal cells of branches of the branched, 

 gonidiophore, termed sterigmata. In many cases the gonidiophores 

 are collected into special receptacles termed pycnidia. 



The sexual organs are modified hyphae. They may be unseptate 

 (e.g. Eremascus, Eurotium Aspergillus, Pyronema), or septate (e.g. 



Ascobolus, Collema) ; they may be 

 quite similar (e.g. Eremascus) or 

 more or less differentiated; they 

 may come into close contact (e.g. 

 Eremascus, Eurotium, Pyronema), 

 or they are developed at a distance 

 from each other (e.g. Collema, 

 Polystigma). 



When, as in Eremascus, the 

 sexual organs are undifferentiated, 

 no special names are given to 

 them ; but when they are differen- 

 tiated the female organ is termed 

 an archicarp, and the male organ 

 a pollinodium when developed close 

 to the female organ, or a sterigma 

 when developed at a distance 

 from it. 



In some forms (e.g. Collema, Pyronema) the archicarp consists 

 of two parts ; a receptive portion, filamentous in form, the tricho- 

 gyne; a fertile portion, the ascogonium (compare Bhodophyceoe, 

 p. 268). In the simpler forms, the trichogyne is absent (e.g. 

 Eurotium, Erysiphese, Ascobolus), the archicarp consisting solely 

 of the ascogonium. The form of the ascogonium is either 

 filamentous, sometimes spirally coiled (e.g. Collema, Fig. 208, 

 Enrotium, Fig. 211) ; or, it is dilated, and spherical or oval 

 (e.g. Pyronema, Fig. 207, Erysipheee). 



The pollinodium may be filamentous (e.g. Eurotium), or dilated 

 and club-shaped (e.g. Pyronema, Erysiphese). 



PIG. 205. Gonidiophore of Penicit- 

 lium glaucum : s a row of gonidia on a 

 sterigma ; m hypha of tbe mycelium. 



