Page:An introduction to physiological and systematical botany (1st edition).djvu/523

 Rh seen in the latter volumes of English Botany more especially.

Mosses are found in the hottest and coldest climates. They are extremely tenacious of life, and, after being long dried, easily recover their health and vigour by moisture. Their beautiful structure cannot be too much admired. Their species are numerous, and in some cases difficult to determine, particularly in the genera Tortula and Orthotrichum; nor is the generic character of the latter so easy or certain as most others. Schreber, Dickson, Swartz, Bridel, Weber, Mohr and Turner are great names in this department of Botany, besides those of whom we have already spoken.

3. Hepaticæ. Liverworts. Of these the herbage is commonly frondose, the fructification originating from what is at the same time both leaf and stem. This character, however, proves less absolute than one founded on their capsules, which differ essentially from those of the preceding Order in having nothing like a lid or operculum. The