84 



MANUAL OF BOTANY 



apothecium. Hyphae from the sterile tissue are interwoven 

 with the filaments from the carpogonimn, so that the apothecium 

 is derived from both. The surface laj'er of the apothecium is 



Fig. 838 



•''^^fi^i§ 



Fig. 841. 



/'/?/. 838. Development of the cleistothecium of Etirotium. a. Pollinodium. 

 h. Carpogonium. c. The carpogonium beginning to form asci. After 



Kny. I'ig. 8.39. Mature cleistothecium of Eurotium. e. VV^all. d. Asci 



containing ascospores. After Kny. Fig. 840. Hymenial layer of the 



mycelium or hyphse of Peziza conve.rulrt. a, h, <; d, f^ f. Successive stages 

 of' development of the asai and ascospores intermixed with slender para- 



physes. After Sachs. Ficj. 841. Perithecium of Peziza (natural size), 



with section showing hymenial layer (slightly magnified). After Kny. 



known as the hymenial layer [figs. 840 and 841). It consists of 

 a number of asci derived from the carpogonium, and of sterile 

 filaments springing from the vegetative hyphae. These are 



