slender, slightly pubescent when young, soon glabrescent; Leaf blade ovate or sub-rounded to elliptic, 2-5 (7)x 1.502.5 cm, young pubescent, soon abaxially
pubescent along midvein, base broadly cuneate to sub-rounded, margin obtusely serrate, serrulate, cuneate, crenate, rarely entire, apex acute or shortly acuminate, lustrous green above and light green below.
In its cephalic morphology Omegops tilabadensis shows similarity to the topotypes of Omegops accipitrinus accipitrinus as revised by Richter & Richter (1933), including the characteristic ornament of the postocular area of fixigena, which is smooth adaxially and covered with eight large tubercles abaxially
. The most significant difference from the types of Omegops accipitrinus accipitrinus, including the lectotype (BGS GSM 7055) and the specimens described and illustrated by Salter (1864), is in the morphology of the eye visual surface, upon which are arranged up to 48 large lenses with no more than four lenses in the vertical row in the Iranian specimens, while in Omegops accipitrinus accipitrinus, it is covered by 56-70 smaller lenses with up to five lenses in the vertical row (Fig.
Pattern 5--flat or protruded adaxially and sharply projected abaxially
in Anteremanthus, Chronopappus, Heterocoma and Proteopsis with abaxial surface rounded (Fig.
retusa by the abaxially
appressed-tomentose laminas with basally eglandular petioles and paired inflorescences.
Utilities in Australia have adopted the practice of abaxially
bored eucalypt poles to extend their service lives.
In adult plants, stipes are nearly circular in section, adaxially sulcate, with one deep groove, and abaxially
rounded; below the epidermis there is a wide hypodermic zone of fibers, 8-10 layers thick and a leaf trace with 3 strands included in a massive parenchymatic central area (Fig.
Fronds < 25 cm long, glands and/or stipitate hairs present, peltate scales present abaxially
; >1.0 mm in diameter 14.
5) shows a slightly arching axial ring, bearing a moderate articulating furrow extending abaxially
Petiole 3-12 mm; leaf obovate to ovate, 3-5.5 cm, thick papery, adaxially pubescent to glabrous, abaxially
, and glabrous.
In Acorus (Acoraceae, Acorales), the putative sister to all other monocots, the perianth is more developed abaxially
than adaxially (Buzgo & Endress, 2000).