Studies in the genus &lt;i&gt;Riccia&lt;/i&gt; (Marchantiales) from southern Africa. 17. Three new species in section &lt;i&gt;Pilifer&lt;/i&gt;: &lt;i&gt;R. elongata&lt;/i&gt;, &lt;i&gt;R. ampullacea&lt;/i&gt; and &lt;i&gt;R. trachyglossum&lt;/i&gt;
Bothalia