The document discusses the classification of Nilssonia, an extinct plant genus. Nilssonia is classified as Order: Cycadales, Family: Nilssoniaceae, Genus: Nilssonia. It had leaf structures similar to cycads but different reproductive structures. Two fossilized leaf examples are described - N. compta had narrow, irregularly segmented leaves up to 40 cm long and 9 cm wide. N. schimidtti had oblanceolate leaves tapering at the base with fine, mostly unforked veins and exposed stomata on the upper leaf surface.

1. BY,
BHANUPRIYA R
M Sc. BOTANY
7661

2.  According to sporne (1965) classification,
Order: Cycadales
Family: Nilssoniaceae
Genus: Nilssonia
 Similar to cyads in growth and leaf morphology
But differ in reproductive structures
It is a form genus of mesozoic leaf fossil.

3.  Eg. N. compta

4. Narrow, nearly band-like or oblong-oval, irregularly segmented
lamina and segments, attached to the upper side of the rachis.
Additional characters include a short distance between the segments,
and a fine, parallel venation with unforked veins.
These leaves were broadly linear and attained a length and breadth of
about 40 cm and 9 cm, respectively.
The lamina of these leaves was cut irregularly into truncate segments.
The veins were parallel and at right angle to the rachis of the leaf.

5. N. schimidtti
 Leaf oblanceolate, shortly petiolate, tapering gradually towards the
base.
 The veins are fine, mostly unforked.
 The leaf is hypostomatic,the upper cuticle is delicate.
 Stomata are not sunken, fully exposed with guard cells.