I would interpret the stem leaf costae to disappear below the leaf apex; it is interested that Brotherus considered this to be C. relaxa s.s., which he characterized (in hiskey) to have costae percurrent to almost percurrent.
Patterson's Creek, Waimakariri Gorge, North Canterbury
Georeferences:
Latitude and Longitude (WGS84):
-43.262019 171.937735
Verbatim locality:
Patterson's Creek, Waimakariri Gorge, N. Canterbury
Verbatim collector:
[Beckett TWN] NZ 469
Standardised collector:
Thomas W. N. Beckett
Verbatim date:
3 . i . [18]93
Start date:
1893-01-03
Land District:
Canterbury Land District
Country:
New Zealand
Habitat:
Wet boggy ground
Specimen notes
Herbarium history:
[Herb T.W.N. Beckett] NZ 469
Supplementary remarks:
c.fr.
central strand lacking; costa of stem leaf c. 75 µm wide near base, tapering evenly, fading below apex; axillary hairs two-celled, with a single elongate terminal hyaline cell (only a few seen near branch apex); stem leaves c. 1.8 x 0.9 mm,
leaves at branch apices disintly denticulate, those on lower branches nearly entire
Allan Fife, October 2006