Figs. 43-50. P. americanum C. H. Ford & Stotl.-Crandall. 43. SEM micrograph showing the ventral surface of a male gametophyte with two rows of ventral scales (v) at the apical region; scale bar = 100 μm. 44. SEM micrograph of the dorsal surface of male gametophyte showing the ( two rows of antheridia (an) that are surrounded by scale-like lamellar extensions (sl) with entire margins, formed from extensions of the dorsal lamellae; scale bar = 120 μm. 45. SEM micrograph of the dorsal surface of a female gametophyte showing an immature pseudoperianth (p) surrounding a cluster of archegonia (a); scale bar = 100 μm. 46. Plant with a mature sporophyte, with an elongated seta (se) and mature capsule (cp), and a small pseudoperianth (p); scale bar = 100 μm. 47. Architecture of the pseudoperianth mouth; scale bar = 100 μm. 48. Optical micrograph of a mass of spores (sp) and elaters (el); scale bar = 50 μm. 49. Elaters; note the 4-6 spiral thickening bands; scale bar = 20 μm. 50. SEM micrograph of a mass of spores (sp) and elaters (el); scale bar = 50 μm.
Fig. 43 from Marsh s.n.; Figs. 44-49 from Marsh and Golden 9387 (ABSH, HEND); Fig. 50 from Marsh and Golden 9388(ABSH, HEND).