Locality
USGS11614
Lat. 60° 36' 36"N Long. 164° 49' 18"W
Baird Inlet (C-8) Quad. Nelson Island.
Description
Leaf: simple; symmetrical; orbiculate; apex obtuse; base decurrent and very shallowly lobate; margin dentate, teeth irregular in size and spacing, apices obtuse with a swollen (? glandular) tip, sinuses shallow rounded; venation suprasbasal marginal perfect actinodromous; primary midvein weak, straight; pectinal veins weak, straight, branching on both ad- and abmedial sides near the margin, subopposite forming an angle of 30° to the midvein, extending to the margin which is slightly inflated where they terminate, craspedodromous; superior secondary veins arising from the midvein at an angle of 25-30° straight, often branching one to three times near the margin, giving off weak branches on both ad- and abmedial sides and terminating in the apices of the marginal teeth; pectinal abmedials straight, arising at angles of 25-35° often branching up to three times, branching being particularly well developed and in the second pair of abmedials from the origin of the pectinals so forming weak b-pectinal veins; a single pair of weak abmedial veins arises from the pectinals at or near their point of departure from the midvein and are recurved and branched on their abmedial (basal) side; a single pair of inferior secondaries arises from the midvein basal to the point of departure of the lateral primaries and are recurved; tertiary veins weak, percurrent, straight or convex forming an acute angle or right angle with both ad- and abmedial sides of the secondary veins.
Remarks
The vein orders in this leaf are poorly defined but the relative strengths of the veins may well have been affected by poor preservation. The actinodromous condition is similarly poorly developed, for example the pectinal veins have a staggered origin on the midvein. There is, however, some suggestion of palinactinodromy in that the b-pectinals are weakly developed and the most basal a-abmedials follow a different course to the others in being recurved and weak. The slight bulging of the margin at the point where the a-pectinal veins terminate also suggests a weak tendency to the lobate condition such as is found in many of the 'platanoid' leaves. The 'rigid' straightness of the a-pectinal veins and parallel secondaries is also present in specimen USGS 11614.56 (form HAPLTL133). Both leaves also have very weak tertiary veins. However, while the basal morphology is similar, the venation appears to differ in that all the third order recurved veins arise from the a-pectinals (a-abmedials) in specimen USGS 11614.56 (form HAPLTL133) while in specimen USGS 11614.4 (form HAPLTL124) they seem also to originate from the midvein basal to the point of departure of the a-pectinals. However, until more specimens are examined it is not known if these differences are significant. Somewhat similar forms have been described as Crednaria inordinata Hollick (1930; Plate 56, Fig. 3; Plate 57, Figs. 2, 3; p. 86).
