Muller as 100 to 61; and his are probably the more accurate
of the two. The contents of the larger pollen-grains appear more coarsely
granular and of a browner tint, than those in the smaller grains. The two forms
of Hottonia thus agree closely in most respects with those of the heterostyled
species of Primula. The flowers of Hottonia are cross-fertilised, according to
Muller, chiefly by Diptera.
Mr. Scott made a few trials on a short-styled plant, and found that the
legitimate unions were in all ways more fertile than the illegitimate (1/17.
'Journal of the Linnean Society Botany' volume 8 1864 page 79.); but since the
publication of his paper H. Muller has made much fuller experiments, and I give
his results in Table 1.13, drawn up in accordance with my usual plan:--
TABLE 1.13. Hottonia palustris (from H. Muller).
Column 1: Nature of the Union.
Column 2: Number of Capsules examined.
Column 3: Average Number of Seeds per Capsule.
Long-styled by pollen of short-styled. Legitimate union:
34 : 91.4.
Long-styled by own-form pollen, from a distinct plant. Illegitimate union:
18 : 77.5.
Short-styled by pollen of long-styled. Legitimate union:
30 : 66.2.
Short-styled by own-form pollen, from a distinct plant. Illegitimate union:
19 : 18.7.
SUMMARY:
The two legitimate unions together:
64 : 78.
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