Studies in the genus &lt;i&gt;Riccia&lt;/i&gt; (Marchantiales) from southern Africa. 21. &lt;i&gt;R. stricta&lt;/i&gt;, &lt;i&gt;R. purpurascens&lt;/i&gt; and &lt;i&gt;R. fluitans&lt;/i&gt;, subgenus Ricciella
Bothalia