Color photo of an epiphytic hornwort with a swollen midrib and single-celled thallus wings

Light micrograph showing precocious endosporic spore germination within a capsule.

SEM of ventral side of thallus showing mucilage clefts (pores) along midrib.

SEM of dorsal side of thallus showing antheridial cavities and sunken archegonia.

SEM, enlarged view, showing single antheridium rupturing chamber roof.

SEM, enlarged view, showing two rows of sunken archegonia, each with six rows of neck cells.

TEM of chloroplast showing central pyrenoid (P) composed of irregularly-shaped subunits.

TEM of the thallus epidermis showing large plastids with interspersed starch that lack a pyrenoid.

SEM of dehiscing sporophyte showing abundant sporogenous tissue.

SEM showing spores amongst elongated pseudoelaters with spiral thickenings.