Revisional study of neotropical Beilschmiedia species (Lauraceae ...

uneven-sized subsidiary cells. This is also true of neotropical Beilschmiedia species. Distinct
subsidiary cells, whose periclinal walls are irregularly thickened and appear granular, occur
in B. angustifolia (Fig. 100), B. curviramea (Fig. 104), B. linharesensis (Fig. 109) and B.
rigida (Fig. 116).
7) The nature of the stomatal/edges. Many neotropical Beilschmiedia species have narrow
stomatal ledges. Slightly wider stomatal ledges are seen in B. angustifolia (Fig. 100), B.
curviramea (Fig. 104), B. linharesensis (Fig. 109) and B. rigida (Fig. 116). Extremely wide
stomatal ledges occur in B. angustielliptica (Fig. 99), B. brenesii (Fig. 102), B. hondurensis
(Fig. 106), whose inner stomatal ledges protrude between the guard cells and the subsidiary
cells, forming "butterfly-shape" (termed in Christophel et al. 1996). B. berteroana also has
very different stomata from the other species, in which the inner stomatal ledges protrude in
parallel to the outer ledges, forming rectangular "box-shape" (termed by Christophel, pers.
comm.) and the ledges themselves are scarcely stained (Fig. 101).
8) Presence/absence and chnracters of various specialized cells. The specialized cells mostly
seen in neotropical Beilschmiedia species are trichomes, which are same as all the trichomes
of Lauraceae thus far reported (Christophel et al. 1996). The trichomes of neotropical
Beilschmiedia species are simple, with their poral bases (e.g., Fig. 86). Although the
trichomes themselves are various among the species (see the section indument in the second
chapter), basal cells of trichomes are relatively uniform. Giant stomata, referred as
"hydathodes" in Christophel et. al. (1996), are sometimes present in neotropical
Beilschmiedia species (e.g., Fig. 97), but there is no significant difference among the
species.
3. Leaf sections
Twenty-two of 27 species were examined for the leaf section study. Beilschmiedia
anay, B . emarginata, B. fluminensis, B. stricta and B . taubertiana could not be studied
because of the lack of material. Pictures of the petiole sections are shown in Fig. 120-121,
midrib sections in Fig. 122-143.
Hypodermis. According to Metcalfe (1987), a single-layered hypodermis has been recorded
beneath the adaxial epidermis in species of Beilschmiedia.
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