Links to information about the specimens in the American Bryophyte Catalogue of The New York Botanical Garden.

Color light micrograph showing longitudinal section of sporophyte with central columella and spores separated by pseudoelaters that extend from the columella to the epidermis.

SEM of longitudinally-sectioned mature sporophyte showing spore tetrads and interspersed pseudoelaters.

Color drawing of reconstruction of spermatozoid.

TEM showing three of the four spores present in a tetrad.

TEM of pyrenoid showing subunits with inclusions of stroma (S).

Color photo showing habit of plants with sporophytes.

Habit of gametophyte with emerging young sporophytes.

SEM of gametophyte thallus.

Light micrograph showing spore tetrads.

SEM of spore showing distal face.

SEM of spore showing proximal face.

SEM showing longitudinal view of opened sporophyte.

SEM of two partial tetrads showing proximal spore surface with minimal ornamentation, distal highly ornamented spore surface and surrounding pseudoelaters.

SEM view of tetrad showing distal spore surfaces and remnant sporocyte wall.

Light micrograph showing unicellular ventral rhizoids.

Color light micrograph of a cross section of the hornwort sporophyte showing zonation.

Color light micrograph of a stomate from epidermis of a hornwort sporophyte.

TEM of sunken archegonium showing basal egg cell, ventral canal cell (VC), and four neck canal cells.

Epidermal cells of a hornwort gametophyte stained with acid fuchsin to highlight the pyrenoid with the large, solitary, starch-laden chloroplasts.