Discussion:P. caudata Huber, in Bull. Soc. Bot. Geneve 1915, ser. 2, 6: 211. fig. 17. 9 Nov 1914.
Although Huber describes the setae at the apex of the stipular sheath as 2-3 mm long, a photograph of the type specimen at F shows the setae as short as 1.5 mm.