230 



COMPARATIVE MORPHOLOGY OF FUNGI 



in vegetative tissue. There regularly appear, however, always in the 

 same order, the long cell with many small nuclei, the long cell with one 

 large, and the short cell with one large nucleus. At this time the 

 trichogyne is not present. Later, however, some ascogonial cells develop 

 to longer, occasionally branched, hyphae which, like the remaining 



Fig. 148. — Polystigmarubrum. 1. Young ascogonium showing all essential parts except 

 the trichogyne. 2. Wall between two ascogonial cells partially resorbed. 3. Completed 

 plasmogamy. 4. Beginning of perithecial formation. Only the dicaryotic cell of the 

 ascogonium remains. ( X 860; after Nienburg, 1914.) 



hyphae, stretch toward the stomata but seldom reach the surface 

 (Figs. 147, 2; 149, 1 to 3). They are called trichogynes by the authors 

 cited here. 



The development of the ascogonium at first proceeds very slowly and 

 fertilization takes place only in December in the dead leaves lying on the 



