1914] MANNING—PORELLA sgl aages 
EXPLANATION OF PLATES XV AND XVI 
figures were drawn with a camera lucida, except figs. 25, 28, and 29, 
and reduced one-half in reproduction. The magnifications appearing in the 
plates are as follows: figs. 1-8, 14-24, and 27, X320; figs. 9 and 26, X115; 
figs. 10-13, X22. 
Fic. 1 i Sacok cells, showing branching. 
Fics. 2-9.—Archegonium series. 
Fic. 2.—First transverse division of initial. 
Fic. 5.—Second vertical wall; probably a third one in plane of plate com- 
ser the cutting-of of a central ce 
6.—Central cell (cen) has cut off cap cell; peripheral cells have 
divided to form jacket. 
— 7.—First division: of central cell. 
G. 8.—The axial row, comprising tl k canal cells (nc), ventral canal 
cell (2 and egg (e). 
9.—Mature stage of an abnormal archegonium showing two distinct 
ais rows. 
= + ees P grke 45 rrulscaA 
Fic. 14, gE esagren tissue bef (e/) are coiled. 
Fic. 14, b.—Mature spore before shedding. 
Fics. Tk27 .—Antheridium series. 
11( Fic. 15.—Antheridial initial (i) cut off from the last segment of the apical 
cell (a), 
Fic. 16.—First transverse division of the initial cell. : 
Fic. 17.—The second transverse division; this division may be either 
tanvere — vertical. 
Fic. 18.—A case in which the second division was vertical. 
Fic. G. 19 Abs this case the second division was transverse, pte aid a 
vertical division 1 in the upper cell; the two lower cells are the stalk 
Fic. 20.—Vertical divisions of the stalk cells (st). 
Fic. 21.—The first periclinal walls cutting off spermatogenous tissue (sp). 
Fic. 22.—Further division of jacket cells; sp, spermatogenous tissue. 
Fic. 23.—Division of Spermatogenous cells by transve Tse Ww 
Fic. mg —Further d 
Fic. 25.—Mature antheridium showing blocking of spermatogenous 
tissue, division of jacket cells by periclinal walls, and the slender stalk con- 
sisting of two rows of cells. 
IG. 26.—Portion of a mature antheridium showing simultaneous division 
of ee cells. 
Fic 27.—Cross-section of antheridium at stage shown in fig. 
: ¥ 16. 28.—Ventral view of gametophyte with one of ‘he am spite 
(upper one) turned back to show the lobing of the dorsal leaves; amp, amphi- 
8astrium; dl, dorsal lobe; 2/, ventral lobe. 
Fic. 29.—Dorsal view of gametophyte with one of the dorsal lobes (d/) 
urned back so as to show sporophyte branch (br); per, perichaetium; 5, 
Sporophyte. 
tan af etalk 
