| Geographical origin | New Caledonia | French Polynesia | Seychelles (*); Maldives | Zanzibar | Brazil |
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| Reference(s) | Present study | Vervoort & Vasseur (1977), as H. buskii | Millard & Bouillon (1973) (*); Present study | Rees & Vervoort (1987), as H. buskii (Stn. 112) | Migotto (1996); present study (*) |
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| Caulus (seen frontally) |
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| - maximum height (cm) | 1.8 | 2.5 | 7 (*); 3.9 | 4.0 | 3.0 |
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| - segmentation | Ho (dist. He) | Ho | Ho | Ho | Ho |
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| - superior nematothecae / internode with opposite cladia | 2-3 | - | 3-4 | - | 2-3 (*) |
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| - nematothecae above hydrotheca in ordinary internodes | 1-2 (exc. 3), in two parallel rows | 2, in two parallel rows | 2-3 (exc. 4), in two parallel rows | 2, in two rows | 2 (occ. 1), in two parallel rows (*) |
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| - number of axillar nematothecae | 2 (rarely 1 distally) | 1 | 1 | 1 | 2 (*) |
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| - internode length | 465-680 | 475-550 | 490-845 | 460-520 | 325-600 |
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| - diameter at node | 45-105 | 100-125 | 110-220 | 270-320 | 110-180 |
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| - length of apophysis | 100-115 | - | 85-110 | - | 75-85 (*) |
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| - length of nematothecae | 90-100 | - | 100-170 | - | 65-95 (*) |
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| - diameter of nematothecae at rim | 45-50 | - | 55-85 | - | 50-60 (*) |
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| Cladia (seen laterally) | | | | - | |
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| - segmentation | He | He | He | He/Ho | He |
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| - number of nematothecae on 1st ahydrothecate internode | 1 (exc. 2) | 1 | 2 (exc. 3), in two parallel rows | - | 1 |
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| - nematothecae on ordinary ahydrothecate internodes | 1 | 1 | 2 (exc. 4), in two parallel rows; distally 1 | 1 | 1 |
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| - number of axillar nematothecae | 1 (rarely 2) | 1 | 1 | 1 | 1 (rarely 2) (*) |
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| - length of quadrangular segment | 45-50 | 45-55 | 45-65 | - | 40-50 (*) |
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| - length of 1st ahydrothecate internode | 210-280 | - | 170-245 | - | 137-320 |
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| - length of ordinary ahydrothecate internodes | 150-195 | 210-250 | 180-230 | Fused 495-580 | 150-200 |
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| - length of hydrothecate internodes | 290-390 | 320-335 | 340-370 | | 240-440 |
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| - diameter at transverse node | 35-40 | - | 60-65 | 115-120 | 50-70 |
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| - length of nematothecae | 60-75 | - | 75-95 | - | 50-70 (*) |
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| - diameter at rim of nematotheca | 30-40 | - | 35-50 | - | 40-50 (*) |
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| Hydrotheca (cladial) |
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| - shape of the rim (lateral view) | Distinctly sinuated | Distinctly sinuated | Slightly sinuated | Reportedly even | Even |
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| - length abaxial wall | 205-240 | 200-220 | 170-220 | 175-200 | 162-237 |
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| - length free adaxial wall | 105-115 | 40-55 | 75-80 | - | 120-135 (*) |
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| - diameter at rim | 175-190 | - | 210-220 | 220-235 | 180-205 |
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| - length apophyses of lateral nematothecae | 65-80 | - | 30-35 | - | 50-65 (*) |
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| - length lateral nematothecae | 90-100 | 85-95 | 85-110 | 95-140 | 75-125 |
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| - diameter of apical chamber of lateral nematotheca at rim | 55-70 | 45-50 | 70-75 | 65-80 | 50-82 |
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| - length of mesial nematotheca | 55-60 | - | 45-50 | - | 50-87 |
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| - diameter at rim of mesial nematotheca | 45-50 | - | 35-40 | - | 35-60 |
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| - length of axillar nematotheca | 45-50 | - | 20-30 | - | 40-50 (*) |
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| - diameter of axillar nematotheca at rim | ca. 35 | - | 20-25 | - | 40-45 (*) |
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| Gonotheca |
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| - length of pedicel | - (♂); ca. 70 (♀) | - (♂); - (♀) | -(♂); - (♀) | -(♂); - (♀) | -(♂); 75-80 (♀) (*) |
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| - length (excluding pedicel) | - (♂); ca. 730 (♀) | - (♂); 400-420 (♀) | <470 (♂) (*); <1150 (♀) (*) | - (♂); - (♀) | -(♂); 800-910 (♀) |
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| - maximum width | - (♂); ca. 340 (♀) | - (♂); 230-250 (♀) | <210 (♂) (*); <730 (♀) (*) | - (♂); - (♀) | -(♂); 310-450 (♀) |
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| - diameter at aperture | - (♂); ca. 225 (♀) | - (♂); - (♀) | -(♂); - (♀) | -(♂); - (♀) | -(♂); - (♀) |
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| - number of basal nematothecae | - (♂); 2 (♀) | -(♂); 1 (♀) | 1(♂) (*); 2 (♀) (*) | - (♂); - (♀) | -(♂); 1-3 (♀) |
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