The genus name comes from the Greek " ceras ", meaning horn, which refers to the paired, spreading horny projections on the male and female sporophylls of all species.
42.
The male cones are solitary, ovoid, 15-22 cm long and 8-12 cm diameter, orange, the sporophylls 35-45 mm long with an upturned apical spine.
43.
The male cones are solitary, narrow ovoid, 25-30 cm long and 5-7 cm diameter, brown, the sporophylls 25-30 mm long with an upturned apical spine.
44.
Translocation also moves nutrients downward from light-exposed surface fronds to sporophylls ( reproductive fronds ) at the base of the kelp, where there is little light and thus little photosynthesis to produce food.
45.
Other researchers have concluded that the mixture of relatively'primitive'vascular tissue and'advanced'sporophylls suggests that the genus evolved separately from the lycopsids, so that its taxonomic placement is uncertain.
46.
Male and female sporophylls are spirally aggregated into determinate stipe and an expanded and thickened lamina with 2 ( rarely 3 or more ) sessile ovules inserted on the inner ( axis facing ) surface and directed inward.
47.
Like other insects of its time, " Rhyniognatha " presumably fed on plant sporophylls which occur at the tips of branches and bear mandibles which may or may not have been used for hunting.
48.
Like other insects of its time, " Rhyniognatha " presumably fed on plant sporophylls-which occur at the tips of branches and bear mandibles which may or may not have been used for hunting.
49.
Lycophytes, where sporophylls may be aggregated into strobili ( " Selaginella " and some " Lycopodium " and related genera ) or distributed singly among sterile leaves ( " Huperzia " ).
50.
In addition to having mycoheterotrophic gametophytes, there are a few members of " Botrychium " that are unique among ferns in having the sporophytes also mycoheterotrophic, producing only small, ephemeral sporophylls that do not photosynthesize.
