__ Bes. 1-21 a.—Figs. 1-3, protonema-like prothallia, with possible beginning of 
apical growth at A in fig. 1, X120; fig. 4, small prothallium with mature antheridia, 
48 1 Pe eas. ee a oe Se ee fi 6 
X60; figs. 5 and 14, lly growth ps; . 6, 
7, 8, and 10, examples of unsymmetrical forms, X120; fig. 13, longitudinal division 
of one protonemal cell, X 120; fig. 15, prothalli ith] late of cells f d before 
- * - o~ fF 
appearance of apical group, X40; fig. 19, prothallium with two growing points, %405 
fig. 20, very small prothallium with mature antheridia, X120; fig. 214, antheridia 
borne on marginal outgrowths, 120; fig. 12a, group of antheridia from central part 
of fig. 12, X120; the other figures show various unsymmetrical arrangements of 
apical groups. 
ei 
