Author: Jan Scholten
Botany: 14 genera; ± 100 species; elongated horn-like structure, the sporophyte; flattened, green plant body; worldwide; damp or humid regions; helical thickenings, twist and thereby help to disperse the spores; relatively large for bryophytes, measuring between 30 and 80 µm in diameter or more; spores are polar, usually with a distinctive Y-shaped tri-radiate ridge on the proximal surface and with a distal surface ornamented with bumps or spines; hornworts, are difficult to find, they grow in winter on fields or at ditch borders, they look like a small grass or like a fresh horsetail.
Leiosporocerotopsida: Leiosporocerotales: Leiosporocerotaceae: Leiosporoceros dussii.
Anthocerotopsida: Anthocerotales: Anthocerotaceae: Anthoceros, Folioceros, Sphaerosporoceros.
Dendrocerotales: Dendrocerotaceae: Dendroceros, Megaceros, Nothoceros, Phaeomegaceros
Notothyladales: Notothyladaceae: Hattorioceros, Mesoceros, Notothylas, Paraphymatoceros, Phaeoceros
Phymatocerotales: Phymatocerotaceae: Phymatoceros.