CRYPTOGAMS 



427 



Small cup-shaped outgrowths, with toothed margins, the gemmiferous receptacles 

 or gemma-cups, are generally found situated on the upper surface of the thallus over 



Fni. :iv_>. Mni-i'liniitiii jK>l)/iniii-iihii. A, A female, plant, with four archegoniophores ot'diflerent a^es ; 

 ft, gemma-cups (nat. size). B, under side of receptacle;** rays: 'i. sheath ;.-;/ sj>orogonium(x3). 

 C, half of a receptacle, divided Longitudinally (x5). D, longitudinal .section of a young si>oro- 

 Konitim ; npf, the foot; x/'- spni-d^ennus tissue : /.'. wall of capsule : /. wall, and h neck, of 

 arche^oniiini ; ;<, pBeado-periantb ( X 70). K, ruptured sporoj,'<miuin ; /,- capsule; .-. SJKUVS and 

 elaters ; ji, |isendo-]>eriarith ; c, archegonial wall (x 10). F nn'elater. G, ripe sj)ores (x 315). 

 H, nerminatinn s]Kii-e (x) ; c/.. protoneina ; (/,).!j;enii-<lisc. with the apical cell r and rhizoid rh 

 (X 100). (<: !: after His< HoFK ; /;. Ii. J-'-H after KSY.) 



the midribs (Fig. 381 b). These contain a number of stalked gemmae, flat, biscuit- 

 shaped bodies of a green colour. The gemmae arise by the protrusion and repeated 

 division of a single epidermal cell (Fig. 380); at maturity they become detached 

 from the stalk (at x, Fig. 380 D). They are provided with two growing points. 



