Lastreopsis kermadecensis, a new fern species from Raoul Island in the Kermadec Islands, New Zealand, with notes on L. pacifica

Figures & data

Figure 1  Lastreopsis kermadecensis. A, Short, dense ctenitoid hairs in adaxial groove of rachis; AK 242151. B, Scattered hairs, with longer red non-ctenitoid and shorter clear ctenitoid, on abaxial surface of costae of primary and secondary pinnae; AK 244341. Scale bars = 1 mm.

Table 1  Characters distinguishing Lastreopsis kermadecensis and Lastreopsis smithiana.

Character	L. kermadecensis	L. smithiana
Ploidy	Tetraploid (2n =164, AK 297199, in sched., BG Murray & PJ de Lange pers. comm. 3 May 2011; permanent chromosome preparation held by BG Murray)	Diploid (n=41, Tindale & Roy 2002)
Mean size of exospore	29–34 µm long, 22–27 µm wide	25–28 µm long, 17–21 µm wide
Stipe scales	Non-clathrate proximally, becoming clathrate distally	Non-clathrate
Number of catadromous pairs of primary pinnae	Usually 0–1; occasionally 2, but then subequal and only barely catadromous	(1 –)2–7, and usually with at least one pair clearly catadromous rather than subequal
Dissection of lamina in apical third of rachis	Pinnate–pinnatifid, except very occasionally 2-pinnate with ½–1 pair of secondary pinnae	2-pinnate with ½–4 pairs of secondary Pinnae to 2-pinnate–pinnatifid, but sometimes pinnate–pinnatifd in small fronds
Glands on indusia	Absent to common with several present per indusium	Absent (or rarely one present on occasional indusia)

Figure 2  Holotype of Lastreopsis kermadecensis, Auckland Museum AK 242201. Scale bar = 50 mm.