Leaflet size 16-29 x 3.8-4.6 cm 30-45 x 2.2-4 cm Leaflet shape Straight (not falcate) Falcate Leaflet dentation Teeth present below Margins entire or with distal half, 20 or more few teeth (<16) limited per leaflet to distal half Stem length To 1.1 m To 4 m Pollen strobilus To 14 x 3 cm To 31 x 4.5 cm size Microsporangia 37-43 41-63 per microsporophyll vule attachment vules not attached to vules attached to flattened tomentose flattened tomentose ppendages protruding ppendages protruding beyond bullae beyond bullae Sclerotesta size -2.3 cm long x 1.4-1.8 .8-3.6 cm long x cm wide 2.1-2.4 cm wide
Pollen strobili two to six per stem apex, to 14 x 3 cm, yellow-beige tomentose, peduncles to 6.5-8.0 x 1-1.4 cm, yellow-beige tomentose with green undertones; microsporophylls arranged in 14-16 orthostichies of 16-25 fertile sporophylls each, obtrullate, 10-11 x 89 mm at pollen shedding, bullae encompassing 1/4 to 1/3 of total length of sporophyll, beige-yellow tomentose, face hexagonal, 5-5.2 x 4.2-4.5 mm, distal facet shallowly indented, microsporangia 37-43, 1.2 x 1 mm, limited to the abaxial surface and aggregated into a single group, lower half of pedicels without microsporangia.
: Leaflike structure giving rise to one or more microsporangia.
It is interpreted as a male cone composed of peltate microsporophylls
, the elongate sporangia being attached to the heel of the microsporophyll
and parallel to the stalk.
In other forms the terminal telomes may have undergone the same processes as in the carpel, and a broad expanded microsporophyll
resulted, as in the Magnoliaceae (Can, right, 1952).
lamina soft, not dorsiventrally thickened,
Isoetes is heterosporous, with each leaf a potential microsporophyll
The compound pollen strobili of Austrotaxus have a unique arrangement whereby the stalks of the microsporophylls
are vestigial, the microsporangia of each microsporophyll
are fused to each other and partially adnate to the microsporophyll
itself (Saxton, 1934; Wilde, 1975).