

divides by v/iuis periyr.naiciiia:' ..o aic i ■ z 

 usual 1;; into Tom' cells at first . Tlius are produced 

 foui' ro\7S, of approximat ly thirty tv/o cells .ac;i, un 

 either side in the length of a sorus of eight macrospo- 

 rangia. Tiiere v;ould tlius "be foui- cells o;;ocite oacJi 

 i-nacrosporangiujn in a sagit'-al section of a capsule a li'- 

 tle older th^m that shov/n in Fi.^ . '^". Eacli of tlie cells 

 arising from that one of the original four nearest tlie ma- 

 crosporangiuTA (ni - sp«, Fi^'s. CI, 02) swells out from th.e 

 placenta and divides into a bascil cell, and an oute^- cell 

 v/hich gives -ise "by inclined v/all'i to tho tetraiiedral 

 apical cell of a microsporangiura; hile th.e cells d rived 

 frcci the original four farthes^t from tho macrospcr-jigium, 

 form the outer cells of the placenta in i hat region (pa.. 

 Figs, ol, 62). The basal cell of th.e microsporangiwn ci'Ji 

 perhaps "be considered as homologous with the stalk cell 

 found in the sporangia of many of the homosporous Lep- 

 tosporangiates, "but there v/as noi-hing neen in the develop- 

 ment of the macrosporangiUii that could "be regarded as 

 sucli, and r.fersilia thus differs from Pilularia, in which 

 Carapbell ('93) has described such a cell as being some- 

 times formed. 



Tlie cells derived from th.e plerome of section VI 

 as described a'iiovc, continue thoir rrc , :ivin": rise to 

 tv/o I'ov/s of cells, as seen in liorizontal section (F 



