7. 



sporocr.rp ii' prer.ont '.::iiy alco arise fro::i a se.'Tiient of the 

 petiole above tlie seconrl, hut iisiip.lly arise", on tlie first 

 sporocarp near its base, and on the side turned toward the 

 petiole. 



Tlie segments of '^'^'<^ apical cell of the laef, or primary 

 marginal cells of Ilanstein ('C5) and Sadei^eck ('7''t)_,are 

 quite rer^ular in sh.ape beinr ciu*ved slices, sliHitlj' th.ir«]'er 

 at the middle of the outer border (Fig. G) eirl viith a slight- 

 ly cur/ed iraier border where the segments overlap {?i'-» 8). 

 Tlie first division vmll to appear in these mp.rginal cells 

 is a lon.'-itudinal and radial anticline (Fig. 9), runninr 

 from about th.e middle of the iriner border to tlie dorsal part 

 of tlie outer border, so as to cut off about a tliird of th.e 

 v/hole semicircular segment tov/ard the dorsal side (T^Fig^., 

 V - 10). We may call tJio third th.us cut off a section, and 

 the part still left of th.e prim.ary marginal cell is th.e 

 secondary marginal cell (m.c.^^ Fi-. 9). Wall I is apparently 

 the "tangential v^alf of Sadebecl: ('74), and section I is the 

 "schiclitzelle" of Hanstein ('65). But tliis ter^inolo^Ty does 

 not seem appropriate liere, when tlie real position of this 

 and the later section walls is taken into accoimt, since it 

 refers to the position of the walls at +'^- surf: ce of the 

 leaf only, v/Iien tlie thing of real importance is th.eir posi- 

 tion in tlie interior, as wo sl^.all see. 



Tlie second v/all formed in the segment is also a longi- 



