no. 



anite stalks, it. is probable ;u;.l L...oy uolu ai'ise iro!:i 

 marf^inal cells of the petiole, but tliis is v. comparati\ 

 rai'e occm^rence and v/as no iictiially seen in cji early 

 stage or devolopiiiGnt'. 



We may return nov to ti.e i'ui'thei- at-'velopment of the 

 se/Tneni.s of the sporocarp. Tlie positions of section walls 

 as given above is in general that found in all th.e sor;- 

 ments, but there are frequent exceptions to tjiis in various 

 segments tha": are worthy of note. Thus section V is u- 

 sually broder in ilie acroscopic marginal cell of tlie soral 

 segments than in the basiscopic cell ( V, Figs. 49, Or). 

 Sometimes section IV is a.lso slightl " broader and thus 

 since section VI does not vary greatly in sizo, the basi- 

 scopic ultimate marginal cells, which are evidently tlie 

 "sorus mother cells" of Bfisgen^are the largest ones of the 

 whole sporocarp. It quite frequently happens also th.at 

 wall IV when formed, in the acroscopic m.arginal cells 

 of the soral se.fTnents and in either ma.rginal cell of the 

 other segments, may bend dovnri at tlie inner end ana inter- 

 sect wall III instOL.d of ruriniiv-; tlirough to meet wall 

 II as usual ( IV, Fig. 48). This was frequently seen 

 in the younger stages as figured and in later stages in 

 the segments of the stalk but was never seen in the basi- 

 copic marginal cell of t:'.e soral segments. %ain, any ■/---- 

 ginal cell of the sporoctn'p except the basicopic one of : 



