Fissidens jonesii Bizot ex Pócs

Bruggeman-Nannenga, Maria Alida, 2022, On the peristomes of the corticolous African species of Fissidens Hedw. (Fissidentaceae, Bryophyta), Cryptogamie, Bryologie 20 (2), pp. 9-36 : 22-23

Fissidens jonesii Bizot ex Pócs

( Fig. 10 )

This species is characterized by mammillose cells, well developed limbidia restricted to the upper leaves of perichaetial stems, bud-like axillary perigonia and by its characteristic thin peristomes with a trellis-like ornamentation. Growing scattered on tree ferns.

Peristome

Distal ends slightly curved inwards when moist, undivided, thin, often broken off, teeth ±130 µm long (hard to measure), tooth base 27-35 µm wide.

Ornamentation

OPL thin, basal 9 cells with thin, smooth, trabeculae and lamellae with vertical lamellar ridges ( Fig. 10A ); more distally the lamellae become papillose; IPL basal 8 cells with thick, double, somewhat papillose trabeculae and smooth to sparsely papillose lamellae; towards the apex the teeth gradually becoming papillose ( Fig. 10B 1 ). Filaments thin, on both OPL and IPL papillose.

Sporophyte

Seta 0.65-1.8 mm long, smooth to rough, not papillose; capsule cylindrical to narrowly cylindrical, 0.7-0.8 × 0.25-0.35 mm, with exothecial cell columns ± 32, the cells oblong with thick vertical walls, operculum not observed, spores variable in size, 15-26.5 µm, papillose.

Description and illustration

Bizot (1974: 133);Bruggeman-Nannenga (in press: 46; fig. 6).

Figures

FIG. 10. — Fissidens jonesii Bizot ex Pócs. A, OPL of two teeth (left one broken off) showing the characteristic trellis-like ornamentation; B, IPL of tooth; B1, detail of distal tooth; C, IPL basal part of tooth; D, same tooth as C with focus on the distal ornamentation; E, IPL basal part; F, moist capsule with erect peristome teeth. A, B from Tanzania, Uluguru Mountains,E slope of Bondwa, Pócs et al. 6260/A, EGR;C-E from Tanzania, Pócs 8616/F, EGR; F from Tanzania,Pócs 6260/B, EGR. Scale bars: A-E, 20 µm; F, 0.5 mm.

FIG. 1. — Fissidens marthae Cardot. A, OPL mid tooth, showing the bifurcation and filaments; B, OPL basal undivided part and bifurcation; C, IPL showing fimbriate trabeculae of the undivided part and high horizontal to oblique IPL (“spiral”) ornamentation of the filaments; D, basal OPL of two teeth; E1-3, side-views of basal part of filament showing the low OPL and thicker IPL; E1, focus on the vertical walls of the OPL; E3, stack of E1 and 2; F, spores. A, D, E from Uganda, Mupanga Falls, Porley U495A, private herbarium Bruggeman-Nannenga; B from Tanzania, Pócs 8633/M, PC; C, F from Central African Republic, S. Ippy, Kéyorédé, Tisserant s.n., PC. Scale bars: A-E, 20 µm; F, 50 µm.