SPORES AND THALLIDIA. 



Fig. 189.— Fenis. 



TS« «ir r r; l^"- '"'"' °l t^^ ^"^^ ^^^ ^"^ cup-shaped investment seen in longitudinal section. 

 Zaltf Tinder sSe of ' ;^«^2/Porfmm ...p.«.,. ^S^r^n^oi aUichenia alplna. ^ Schizcea fistulosa. ^ BotrycMum lanceo. 

 hlTn , ^"'^'^'^.f ^''^ °^ '^ P'°n^ of Gleichenm alpuia; in the two upper cavities the sporangia are covered by leaflets in 

 r T ?,°f '' ^''' ''"P"'"'^- "' " ^^""''^ «^ ^^'^''^^'^ ^'^^«»''- ^^ Longitudinal section through a Sorus and Cup of 

 Cyahea :3 Sporangium of Cyathea. u Sporangium of Polypoäium. la Sporangium of ScÄi.«.«. ^ üm^r side of the 

 Prothalhum of Spleenwort. i. 2, 4, ., 6, ., a natural size ; a, 9, 10, 11, 12, .3, u 15, xs niagnifled from 6 to 20 tin'es 



