Sentence:  <WSD>Gemmae</WSD> are frequently longer than wide or of irregular shape. / According to Degenkolbe, <WSD>gemmae</WSD>-bearing leaves are always different in form from normal leaves. 
Meaning of the word marked with <WSD> tags:  A bud; an asexual reproductive structure, as found in liverworts and hydra, able to produce new individuals from a cluster of cells.