138 



STRUCTURAL BOTANY 



functions. The whole capsule is covered by a well- 

 marked epidermis, which, on the apophysis, contains 

 stomata. In the upper part of the capsule the wall is 



several cells in thickness ; the 

 hypodermal layers are colourless, 

 w T hile those towards the interior . 

 contain chlorophyll. Connected 

 with these inner cells of the wall 

 are filamentous strands, also con- 

 taining chlorophyll, which extend 

 across the intercellular space, 

 and form a junction with the 

 internal tissues. The central 

 mass is narrow below and ex- 

 panded above, assuming a barrel- 

 like shape. It is from this part 

 that the spores are produced. 

 The archesporium forms at first 

 a single cellular zone, which 

 has a hollow cylindrical form, 

 or, more accurately, is shaped 

 just like a barrel with the ends 



io 63.-Cai.sule of Funaria knocked out ( see Fig, 63, a). 

 in longitudinal section, ap, ^ 3 \ 



the apophysis; a, a, the The archesporial layer is separ- 



avchesporium, forming a , i j ^i p j n fp T . P pll 11 l flr c-nnpp 



single layer of cells (lightly atecl tr m tn 



shaded) ; it surrounds the by a zone of sterile tissue called 



aSatingtiss^isS the outer spore-sac. Within the 

 ly shaded. The operculum archesporium is the large central 



closes the top of the cap- ,, ., -, -, , 



sule, above the columella i; HiaSS of Sterile Colourless tlSSlie 



its individual cells are not ^} ie columella), which is COn- 

 shown. The dark spots , . , 



in the epidermis of the nected below by a thinner strand 

 apophysis indicate the ^h fae tissue of the apophysis. 



stomata. Magnified 14. 



(After Haberlandt.) The layer between archesporium 



FIG. 



