39.1. In order to be validly published, a name of a new
taxon of non-fossil algae of specific or lower rank published
on or after 1 January 1958 must be accompanied by an illustration
or figure showing the distinctive morphological features, in addition
to the Latin description or diagnosis, or by a reference to a
previously and effectively published illustration or figure.
39A.1. The illustration or figure required by Art. 39 should
be prepared from actual speci-mens, preferably including the holotype.