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DOUGLAS HOUGHTON CAMPBELL 
side; the antheridial branches are developed from the other side only 
of the main shoot (fig. S, A). 
While the antheridia are produced for the most part in two rows 
corresponding to the two sets of segments cut off from the apical cell 
some of them may be formed almost in the median line of the shoot, 
so that an imperfect third row may be present. Each antheridium is 
covered by a scale with irregularly laciniate margin, and the lamina 
of the antheridial shoot also has its margins irregularly toothed and 
Fig. 3. A. Male plant, with the lamina on one side entirely suppressed; cf,the 
antheridial branches; X 2. B. Male plant with antheridial branches developed on both 
sides of the midrib. C. An antheridial branch, showing the antheridia covered by 
the subtending scales; X 25. D. Horizontal section of a very young antheridial 
branch, X about 35. 
lobed (fig. 3, C). In the arrangement of the antheridia, Podomitrium 
Malaccense recalls very strongly Blyttia (Mittenia) ZoUingeri,^ and 
perhaps even more Calycularia radiculosa (Sande Lac) Steph.^ 
The youngest antheridia occur close to the growing point of the 
shoot. The beginning of the subtending scale is evident as soon as 
2 Campbell and Williams, loc. cit. 
* Campbell, D. H. The Morphology and Systematic Position of Calycularia 
radiculosa (Steph.). Reprint from Dudley Memorial Volume, Stanford University, 
1913- 
