BRYOPHYTES: Fossombroniineae

Plate I

Figs. 87-93. P. preissii Lehm. 87. SEM micrograph of the female plant; scale bar = 400 μm. 88. Female plant showing a developing sporophyte (sp) on each branch of the furcated thallus; scale bar = 1.5 mm. 89. Transverse section of a female thallus showing the strongly convex midrib (m) on the ventral surface (vs); scale bar = 2.0 mm. 90. Thallus wing showing a gradual gradation from quadrate to vertically elongate cells and a broadly sinuate thallus margin; scale bar = 100 μm. 91. Thallus wing margin showing the scarcely distinct marginal cells (mc); scale bar = 100 μm. 92. Lamella showing a broadly sinuate margin and somewhat distinct marginal cells; scale bar = 100 μm. 93. Dissected pseudoperianth (p) showing widened mouth that is divided and ciliated (ci); scale bar = 1.0 mm.
Figs. 87, 92, 93 from the lectotype, Preiss s.n. (S); Fig. 88, 90, 91 from Scott 4185 (AD); 89 from Duguid s.n. (MPN)
Plate II
Figs. 94-100. P. preissii Lehm. 94. Pseudoperianth mouth showing uniseriate cilia (ci); scale bar = 100 μm. 95. Female plant showing two apical tubers (t); scale bar = 1.0 mm. 96. Mass of spores (sp) and elaters (el); scale bar = 50 μm. 97. SEM micrograph of a mass of spores; scale bar = 10 μm. 98. SEM micrograph of a spore showing the distal surface with the lamellae (le) and aerolae (ae); scale bar = 10 μm. 99. SEM micrograph of an immature spore showing the proximal surface with the undeveloped central pucker (pp); scale bar = 10 μm. 100. SEM micrograph of a spore showing a close up of the pucker (pp) of the proximal surface; scale bar = 10 μm.
Figs. 94, 95 from Preiss s.n. (S); Figs. 96-100 from Duguid s.n. (MPN).