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Dacrydium x suprinii NIMSCH
Characterization

II. Introduction [D]

     

D 1  Dacrydium x suprinii NIMSCH

(Dacrydium araucarioides x Dacrydium guillauminii)

D 2  Holotype

Collected:      29.12.2005
Collector: H. NIMSCH, Freiburg
Location: Chutes de la Madeleine
Collective No: 2122
Herbarium: Ruhr-Uni-Bochum
Lehrstuhl Spezielle Botanik
Prof. Dr. STUETZEL
International herbarium: BOCH
More collective No: 2121 collected: Grand Lac 29.12.2005
2123 collected: Rivière des Lacs 29.12.2005

D 3  Distribution

Dacrydium x suprinii is growing exclusively at the same habitats like D. guillauminii.
There only three sites known, all within the distribution area of D. guillauminii.
More findings may be possible, but chances are limited due to the fact that the overall distribution area of D. guillauminii is small (see also distribution map)

D 4  Description

Dacrydium x suprinii is a natural hybrid, the characteristics of which are to be classified exactly midway between the parent species.
This is confirmed by every feature.
Dacrydium x suprinii is a small tree, reaching up to a maximum height of 4 m.
In its youth, the tree has a crown of a uniform structure of whorls, but it soon develops the erratic crown structure of the age.
The forest is not differentiated by heights in the sense of being multi-storied, instead it is low, open and flooded by light, with some larger trees growing up to heights of 3-6 m particularly within the narrow, gallery-like parts.
These are representatives of the genera Myodocarpus, Dacrydium, Agathis, Araucaria and Neocallitropsis.
Seedlings of Dacrydium x suprinii were not found, but perhaps they were not identified as such, as seedlings of D. araucarioides  and D. guillauminii resemble each other very much and therefore those of D. x suprinii certainly resemble both of the former.
Juvenile and adult needle features keep the median of the parents.
20 dacrydium x suprinii branchletAdult needles reach a length of 5-12 mm.
Needle age-groups are indistinct, so that it is difficult to determine their age, but they clearly are perennial.
The few seeds that could be found are located as 1-2 seeds inside the cone and reach 3,5 mm. 
Due to the very few samples this statement regarding the seeds claims no general validity.

Dacrydium x suprinii
is growing at the same altitude as D. guillauminii.
The age of the hybrid is analogously rated as with D. guillauminii  being at least 250 years old (Statement by B. SUPRIN, Nouméa).

pfNachObenDacrydium x suprinii: Branchlet
(H. NIMSCH)

 
17 dacrydium x suprinii seeds unripe 
pfNachOben Dacrydium x suprinii
Seeds unripe

   11 dacrydium x supriniii young tree
pfNachOben
Dacrydium x suprinii
Young Tree

12 dacrydium x suprinii branchlets
pfNachOben Dacrydium x suprinii
Branchlets

13 dacrydium x suprinii old tree
pfNachOben Dacrydium x suprinii
Old Tree

15 dacrydium comparison 250x167
pfNachOben Contrasting Dacrydium araucarioides, Dacrydium x suprinii and
Dacrydium guillauminii
(click to zoom into new window)

19 dacrydium x suprinii seeds ripe 400
pfNachOben Dacrydium x suprinii
Seeds ripe

D 5  Descriptive botany of plots

Sample plot No 1
Vegetation inventory No 1, Plaine des Lacs.
Location: New Caledonia, Plaine des Lacs, Grand Lac, western shore
Date:       December 29. 2005
Inventory site: 10 x 10 m
Habitat:          The lake shore at the most western side of the Grand Lac, a plane sloped, 3 m broad beach without any vegetation; adjacent a belt of vegetation, 15 up to 25 m broad and plane sloped.
Adjacent to that open vegetation is located at higher, hilly and dryer ground.
Soil: Coarse texture; at small patches: A layer of up to 2 cm thick serpentine with low humus accumulation.
More than 50% of the area are covered with bare ultra- alkaline rocks shaped like small, flat plateaus.
Inventory site: It is located within the above mentioned, plane sloped belt of vegetation adjacent to the 3 m broad beach without vegetation.
At the western border of the inventory site, the level of a ground streak of about 1-2 m is about 1 m higher.
Only there, one specimen each of  Dacrydium araucarioides and Neocallitropsis pancheri could be found reaching a height of 3 m.
The whole vegetation of the remaining area, including Dacrydium x suprinii, only reaches heights of 1 m, trending to grow even lower towards the lake side.
The high proportion of Retrophyllum minor is obvious.
At this site as well as at the whole area of the Plaine des Lacs the proportion of herbaceous plants is remarkably low.
 

 

 

21 dacrydium x sample plot no 1
pfNachOben
Dacrydium x suprinii
Sample plot No 1


22 dacrydium x sample plot no 1 survey 400
pfNachOben Dacrydium x suprinii
Sample plot No 1

23 dacrydium x sample plot no 1 survey tab 400
pfNachOben Dacrydium x suprinii
Sample plot No 1

24 dacrydium x sample plot no 1 survey cross-section 400
pfNachOben Dacrydium x suprinii
Sample plot No 1
Cross section


Sample plot No 2
Vegetation inventory at the Rivière des Lacs.
Location:         New Caledonia, Plaine des Lacs, Rivière des Lacs, southern shore
Date:        December 29. 2005
Inventory site: 10 x 10 m
Habitat:         Southern bank of the Rivière des Lacs - Chutes de la Madeleine.
A stepped and precipitous bank with vegetation growing as far as the edge and 2 m beyond into the running water.
The dense gallery forest, well supplied with water, grows about 5 m wide and is flooded up to levels of 5 m at irregular intervals.
Soil: 30% of the area are covered with bare ultra-alkaline rocks.
The remaining area is characterized by serpentines of different thickness ranging from 0 to 30 cm.
The humus layers of the area reach different thickness ranging from 0 to 10 cm, probably due to the step-like appearance of the terrain.
Inventory site:     It is located within the stepped and precipitous bank adjacent to the river bank.
At this site the author found the first hybrid in January 1994.
It is growing merely about 4 m off the edge between D. guillauminii and Retrophyllum minor towards the valley side and D. araucarioides towards the mountain side, only 1-2 m away from this species.
Its height reaches 3–4 m.
All known specimen of Dacrydium x suprinii are sprouting at sites directly adjacent to the water, but not always within.
In the area of gallery forest, Retrophyllum minor and Dacrydium guillauminii are growing densely close and as far as 2 m within the running water, so that the distance between the single plants often amounts to merely 30 – 50 cm.
The forest is not differentiated by heights in the sense of being multi-storied.
In the low lit up wood, especially within the narrow, gallery-like part, some larger trees are growing up to heights of 3-6 m.
These belong to the genera Myodocarpus, Dacrydium, Grevillea, Neocallitropsis and Retrophyllum.
Just here, Dacrydium guillauminii and Retrophyllum minor reach heights of 4 m.
The age of D. guillauminii is estimated to be 300 – 400 years (Statement by B. SUPRIN, Nouméa).
The trunks of the two above mentioned species are thickened, partly up to 1,5 m above water level.
This feature is more pronounced in Retrophyllum minor.
 

 

 25 dacrydium x sample plot no 2
pfNachOben Dacrydium x suprinii
Sample plot No 2

27 dacrydium x sample plot no 2 survey 400
pfNachOben Dacrydium x suprinii
Sample plot No 2

28 dacrydium x sample plot no 2 survey tab 400
pfNachOben Dacrydium x suprinii
Sample plot No 2

29 dacrydium x sample plot no 2 survey cross-section 400pfNachOben Dacrydium x suprinii
Sample plot No 2
Cross section

Sample plot No 3
Vegetation inventory at the Rivière des Lacs.
Location         New Caledonia, Rivière des Lacs, western shore
Date:          December 29. 2005
Inventory site: 10 x 10 m
Habitat: The inventory site is a narrow, step-shaped and precipitous streak of terrain along the river, about 3-7 m broad and bordering at a rocky terrace  2-4 m high.
The recorded group of plants extends to about 75 m length.
Presumedly, previous fires have repeatedly destroyed the vegetation on and above the bordering terrace, for it differs strongly in composition and age from that at the inventory site. 
A more precise inventory of the vegetation was forestalled, due to the difficult terrain which is terraced with steep slopes.
The following species are dominating, but a smaller proportion of species, smaller than 1 m and forming the understory vegetation, remains unrecorded.
It may be stressed that in spite of all biotic or abiotic dangers at this relatively small site at least eight species of conifers have survived to an age of more than 300 years.
Adding the Auraucaria muelleri growing at the other side of the river, amazingly nine conifer species could be found within an area of about 300 m2.
These are Neocallitropsis pancheri topping heights of 5 m, Dacrydium guillauminii (4 m), Retrophyllum minor (5 m), Dacrydium araucarioides (5 m), Podocarpus novaecaledoniae (1 m), Dacrydium x suprinii (3 m), Araucaria bernieri (6 m), Agathis ovata (5 m) and Araucaria muelleri (1 m).
This multi-storied old vegetation is mingled with Balanops pancheri, Myodocarpus fraxinifolius, Lepidosperma perteres, Dracophyllum verticillatum and others.
Above the rocky terrace a lot of Gymnostoma deplancheanum and a few Dacrydium araucarioidesPodocarpus novaecaledoniae and others can be found.
Near and within the running water grows the endemic fern Blechnum francii.

 

 

 

 

30 dacrydium x sample plot no 3
pfNachOben Dacrydium x suprinii
Sample plot No 3

31 dacrydium x sample plot no 3 survey 400
pfNachOben Dacrydium x suprinii
Sample plot No 3

32 dacrydium x sample plot no 3 survey tab 400
pfNachOben Dacrydium x suprinii
Sample plot No 3

33 dacrydium x sample plot no 3 survey cross-section 400
pfNachOben Dacrydium x suprinii
Sample plot No 3
Cross section


34 dacrydium x suprinii and dacr guill
pfNachOben Old Trees of Dacrydium x suprinii (foreground)
and Dacrydium guillauminii (background)

35 dacrydium x suprinii trunk
pfNachOben Dacrydium x suprinii
Trunk of the old tree
  36 dacrydium x suprinii and dacr guill
pfNachOben Dacrydium x suprinii
Surrounded from Dacrydium guillauminii
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