29 • 

 IV of the leaf sogncnts ( V, Fir. 4n), and soon after 

 this t^ie li\?,t soction v/i.ll ( VI, Fip-, 4n) ic i^o-rraed. near 

 the dorsal side of the mrj'fjinal cell. Tlio ultim te mar- 

 ginal cell is tlu.is of tiie s venth f^radc liore, vtA not of 

 the sixth grade as in tjie leaf. 



Wlien a second sporocarp is formed on a leaf, it nsiially 

 arises from a marginal cell of the second, oi' third seg- 

 ment of the first sporocarp on the side of the latter 

 that is turned tov/ard the petiole v^liich. hears it (F.^, Fig. 

 40), and a third sporocarp may probably arise from th.e 

 second in the st'jne v/ay. Tlie exact ori.'-:in 'of the apical 

 coll here in tlie marginal cell v/as not. seen but it is 

 reasonable to expect it to be like thjit of tlie first spo- 

 rocarp in the marginal cell of the leaf, and the earliest 

 ^soen also indicate that this is true. This origin of th.e 

 yoimger sporocarps from Uie older ones, explains the occur- 

 rence of the mature sporocarps in pairs or trios on a com- 

 mon stalk, tlicit v;as mentioned above. But v.iio portion of 

 the stalk of a pair' tlitit is common to ])oth is not, as sug- 

 gested by A. Braim ("70), fonned by tlie fusion of t o o- , 

 riginally separate stalks, but it is the lov/er port. ion of 

 tlie simple stalk of the oldor sporocai-'p, cUid so of the com- 

 mon stalk of the second ^md tliird sporocarps of a trio. 

 Wliere tv/o sporocarps are inserted on the petiole by sep- 



