Geoscience Reference
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Table 1. Compared characters of fertile organs in the Aneurophytales (Aneurophyton excluded)
Taxon
Tetraxylopteris
schmidtii
Tetraxylopteris
reposana
Triloboxylon
ashlandicum
Rellimia thomsonii
Moroccan specimen
References
Bonamo & Banks 1967
Hammond & Berry
2005
Scheckler 1975
Leclercq & Bonamo
1971; Bonamo
1977
This paper
Position of fertile
organs on main axis
Distal
Distal
Between vegetative
regions
Distal
Probably distal
Arrangement of fertile
organs on main axis
(organotaxy)
Opposite decussate
Opposite decussate
Helical
Helical
Helical
Length of fertile organs
(cm)
.2
2
1.5 - 2.0
1 - 4
2
Number of proximal
dichotomies
2
2
2
1
1
Number of pinnate
orders of branches
3
3 - 4
1 (sporangial stalks)
3 - 4
2
Sporangial attachment
Singly
Singly
Singly or in pairs
In pairs; also singly
or in 3-4
-
Size of sporangia (mm)
2 - 5 long, 0.4 - 0.8 wide
0.9 - 2.6 long, 0.2 -
0.6 wide
2 - 3.5 long, 0.5 - 0.8
wide
Average 3.5 long,
0.5 wide
Up to 6 long,
0.3 - 0.4 wide
Shape of sporangia
Oblong-oval, acute apex
Elongate, acute to
slightly rounded
apex
elongate, apex
apiculate
Elongate, acute apex
Elongate, acute apex
Dehiscence unknown
Longitudinal dark line;
dehiscence line
opposite
Longitudinal dark
line; possibly
dehiscence
Longitudinal dark
line; dehiscence
longitudinal
Longitudinal dark
line; possibly
dehiscence
-
Spores
Rhabdosporites langii
-
-
Rhabdosporites
langii
-
 
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