Discussion in relation to previous studies

Patel (1974) described the Winteraceae (Pseudowintera) of New Zealand. Carlquist (2001) discussed the origin of ves-selless wood on the basis of Exosperumum, Belliolum, Bubbia, Drimys, Tasmannia, Takhtajania and Zygogynum. These genera were also described in six other studies (see Gregory 1994). Gregory (1994) mentions a total of 30 references for the stem anatomy of Winteraceae. Feild et al. (2000) discuss results of phylogenetic analysis and conclude that vesselless xylem may be secondarily derived. The present study confirms all findings from previous autors.

Present features in relation to the number of analyzed species

IAWA code frequency

Present features in relation to the number of analyzed species

IAWA code frequency

Total number of species

6

1

growth rings distinct and recognizable

3

2

growth rings absent

4

20

intervessel pits scalariform

5

59

vessels absent or indistinguishable from fibers

6

60

vascular/vasicentric tracheids, Daphne type

0

60.1

fibers absent

0

61

fiber pits small and simple to minutely bordered

(<3 pm = libriform fibers)

0

62

fiber pits large and distinctly bordered

(>3 pm = fiber tracheids)

6

70

fibers thin- to thick-walled

6

76

parenchyma apotracheal, diffuse and in aggregates

6

98

rays commonly 4-10-seriate

6

108

ray: heterocellular with >4 upright cell rows (radial section) 6

110

rays with sheet cells (tangential section)

6

R1

groups of sieve tubes present

1

R3

distinct ray dilatations

1

R4

sclereids in phloem and cortex

1

R12

with laticifers, oil ducts or mucilage ducts

1

P2

with laticifers or intercellular canals

1

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