| → would be a dominant form 1861 1866 1869 |
| will then be dominant 1872 |
|
| →
(
i.e.,
those including many species) being
1869 |
| being 1859 1860 1861 1866 |
|
(
i.e.
, those including many species) being
1872 |
|
| → a 1859 1860 1861 1866 1869 |
| the former will be found to include a 1872 |
|
|
or parasitic fungus
its allies in the above respects, it
→would be a dominant form
within its own class. |
|
Species
of
the
Larger
Genera
in
each
Country
vary
more
frequently
than
the
Species
of
the
Smaller
Genera.
|
| If the plants inhabiting a
described in any
be divided into two equal masses, all those in the larger genera
→
(
i.e.,
those including many species) being
placed on one side, and all those in the smaller genera on the other side,
→a
somewhat larger number of the very common and much diffused or dominant
might have been anticipated; for the mere fact of many species of the same genus inhabiting any country, shows that there is something in the organic or inorganic conditions of that country favourable to the genus; and, consequently, we might have expected to have found in the larger genera, or those including many species, a
proportional number of dominant species. But so many causes tend to obscure this result, that I am surprised that my tables show even a small majority on the side of the larger genera. I will here allude to only two causes of obscurity.
and salt-loving plants
very wide ranges and are much diffused, but this seems to be connected with the nature of the stations inhabited by them, and has little or no relation to the size of the genera to which the species belong. Again, plants low in the scale of organisation are generally much more widely diffused than plants higher in the scale; and here again there is no close relation to the size of the genera. The cause of lowly-organised plants ranging widely will be discussed in our chapter on
|
