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A TEXTBOOK OF THEORETICAL BOTANY 



into (f.i) and {c.2). Of these two cells (c.z) now divides by a longitudinal 

 septum to form two cells {c.2.1) and (c.2. 2). The latter cell (f.2.1) now 

 divides transversely into two cells : {s) which divides no further and becomes 



Fig. 285. — Stigmatomyces baeri. Stages in the development of the organism. 

 For details see text. {After Thaxter.) 



the Stalk of the perithecium, and {p) which forms the perithecial wall. At 

 the same time cell (f.2.2) divides by a transverse wall into two other cells, 

 (^.i) and (/).i), the former gives rise to the stalk of the perithecium, while 

 {p.i) contributes to the wall of the perithecium. By further division of the 

 cells {p) and {p.i) a two-layered perithecium wall is finally produced as may 

 be seen by the subsequent diagrams, and the actual cell divisions need not 

 be followed in detail. 



