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279
to all authors they have nothing to do with the formalion of tissue
and never give rise to new cells. There is, thus, no reason to
call them »initials» or »apical cells».
The anatomy of the growing region is illustrated in fig. 1 a’; the
structure is filamentous, the outer short cells gradually forming a
pseudoparenchymatic tissue; comp. also Ro, fig. 19. Many of the
end cells are prolonged into hairs with basal growth and covering
the whole apex. Some of their lower cells may become distinctly
Fig. 1 a. Section through part of meristem, x 360. 6. Section through young
cortex, X 360. c. Section through old cortex, x 360
moniliform; they have chloroplasts while the remainder of the hairs
consists of very long, cylindrical, almost hyaline cells. MıTcHELL
and WHITTING’S figures only show short hairs wilh the walls bulging
unilalerally, the upper part probably having been cut or otherwise
lost. The hairs are of very short duration, and a little below the
apex no trace of them is left. The structure described by these
authors is not the young but the mature, with closely packed
! All figures drawn at double the enlargement indicated and reduced to half size.
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