296 BOTANICAL GAZETTE [april 



through a pine root such as those shown in the lower half of fruit body; deep- 

 staining structures near center of section are sexual cells which later give rise 

 to ascogenous hyphae; at base young rhizoids are shown in section. 



Fig. 4. — Median longitudinal section through a young fruit body in 

 which setae have developed early, X40; these may be seen projecting above 



■ 



layer of palisade hyphae. 



Fig. 5. — Median longitudinal section through a young fruit body, X40; 

 palisade layer of hyphae at periphery shows plainly; note sexual cells at 



center of section. 



Fig. 6.— Median longitudinal section through a slightly older fruit 



body, X40. 



Fig. 7. — Median longitudinal section through a somewhat older fruit 

 body in which the layer of paraphyses is being differentiated from palisade 

 layer, X29. 



Fig. 8. — Layer of paraphyses shown in fig. 7 enlarged to show structure 

 more clearly, X40; note indefinite line of demarcation between layer of 

 paraphyses and palisade layer of sterile margin. ♦ 



Fig. 9. — Approximately one-half of a median longitudinal section through 

 considerably older fruit body, X32; note well defined layer of paraphyses, 

 sterile margin, and definite, deep-staining zone below the paraphyses made up 

 of tips of ascogenous hyphae; ascogenous hyphae can be seen originating 

 near base of apothecium and branching profusely as they ramify throughout 

 the fruit body and approach hymenium. 



Fig. 10. — Portion of section such as presented in fig. 5 enlarged to show 

 structure of palisade layer, X192; note deep-staining tips of hyphae. 



Fig. 11. — Longitudinal section through young hymenium of fruit body 

 of about the same age as that shown in fig. 9, X 192; note numerous prominent 

 setae originating below hymenium; note also deep-staining layer at tips of 

 paraphyses, resulting from glutinous secretion poured over hymenium by 

 setae. 



Fig. 12. — Longitudinal section through immature hymenium of fruit 

 body somewhat larger than that shown in fig. 9, X192; note slender, septate 

 paraphyses, prominent tubular setae, and young deep-staining asci. 



Fig. 13.— Longitudinal section through hymenium of fruit body approach- 

 ing maturity, X192; asci have not yet formed spores; fusion nucleus is 

 visible in some cases. 



Fig. 14. — Portion of section given in fig. 4 enlarged to show setae at 

 margin of fruit body, X192; note that they are much larger in diameter and 

 more deeply staining than the hyphae of palisade layer. 





