Page:An introduction to physiological and systematical botany (1st edition).djvu/347

 Rh, is a remarkable example. Few botanists indeed had detected them in the Lemna or Duck-weed, so abundant on the surface of still waters, and Valisneri alone for a long time engrossed the honour of having seen them. In our days however they rewarded the researches of the indefatigable Ehrhart in Germany, and on being sought with equal acuteness, were found in England. Three species have been delineated in ''Engl. Bot. t.'' 926, 1095 and 1233, from the discoveries of Mr. Turner and Mr. W. Borrer. The flowers of Mosses, long neglected and afterwards mistaken, were faithfully delineated by Micheli, carefully examined and properly understood by Linnæus as he rambled over the wilds of Lapland, and at length fully illustrated and placed out of all uncertainty by the justly celebrated Hedwig. These parts indeed are still unknown in ferns, or at least no satisfactory explanation of them has reached me, though the seeds and seed-vessels are sufficiently obvious.