Category Archives: Bryophytes

New Caledonia fern collecting

I’m just back from three weeks collecting ferns in New Caledonia.

For a place so close to New Zealand (shorter flight time than to Australia), I knew very little about New Caledonia. I expect that is true for many New Zealanders, and it presumably reflects our very different cultures, not least being the language difference (French predominates in New Caledonia, and English* in New Zealand).

New Caledonia is not an independent country but a special collectivity of France. Nouméa, its largest city, is like a piece of France transplanted to the tropical Pacific. The original Melanesian character is perhaps most strongly retained in the (north-)east.

Wikipedia page on New Caledonia.

Wikipedia page on the indigenous Kanak people.

Some of Te Papa’s existing collections from New Caledonia.

We stayed in villages during some of our trip. Here at Bas Coulna, before we left to climb Mount Panié, we had a traditional-type hut. Photo Leon Perrie. © Te Papa.

Funded principally by a grant from the USA’s National Science Foundation, our collecting expedition was led by Matt von Konrat (Field Museum), Blanka Shaw (Duke University), and Louis Thouvenot, who was our guide and translator (none of the others in the expedition had been to New Caledonia before or spoke French, although Juan’s Spanish was useful on many occasions). The main goal was to collect Frullania liverworts, but we variously collected mosses, liverworts, and lichens – these are all small plants that are often neglected. I was invited along to collect ferns.

Interview with Radio Australia’s Pacific Beat programme about the expedition.

Blog post on similar expedition to Fiji in 2011.

The black stems, each only about 1 mm wide, of a Frullania liverwort creeping over a white lichen on the trunk of a mangrove tree. Photo Leon Perrie. © Te Papa.

New Caledonia is home to about 270 ferns and lycophytes. That’s more than New Zealand, despite a land area less than 10%. About 35% of New Caledonia’s ferns and lycophytes are endemic (i.e., only found there), which is very high for a tropical Pacific island. However, the last comprehensive account is from 1969, and it is clear that much revision is needed. A reflection of this is that there are (at least) two species of new tree fern needing scientific description. During the three week expedition, I made 232 collections, of at least 160 different species. These include new species, new records for New Caledonia, and rediscoveries (species not recorded for a long time).

Te Papa’s updated checklist of Fiji’s ferns, which I hope to replicate for New Caledonia.

The Endemia website includes photos of many of New Caledonia’s ferns, and is an excellent photographic resource about New Caledonia’s biodiversity

In coming days I’ll post about some of the plants I saw, particularly, of course, the ferns.

Trip leader Matt von Konrat collecting Frullania liverworts up a mangrove. Photo Leon Perrie. © Te Papa.

Collecting near Tinou. Photo Leon Perrie. © Te Papa.

All available space in our lodgings was often given over to drying specimens. Louis’s bed is somewhere under these paper packets. Photo Leon Perrie. © Te Papa.

On our way to Mount Panié. We were fortunate to have horses carry our packs for the first part of the trek. Photo Leon Perrie. © Te Papa.

Maurice, one of our guides for Mount Panié, using a wreath of the fern Paesia rugosula to complement the shade of his cap. Photo Leon Perrie. © Te Papa.

Albeit clearly exhausted, here’s proof that I did make it to the summit of Mount Panié, New Caledonia’s highest point at 1629 m above sea level. Photo Leon Perrie. © Te Papa.

The expedition couldn’t have been the success it was without the assistance of many, especially Louis Thouvenot, as well as the Nouméa herbarium, the government land managers, the Kanak land owners and guides, and our contacts at Dayu Biik, Conservation International, and Société Calédonienne d’Ornithologie.

* I can note that the so-called ‘English’ speech of the two (monolingual) New Zealanders was constantly belittled by the other members (all multilingual) of the expedition, none of whom spoke English as a first language. Matt and I weren’t sure what to make of this.

Plant Hunt at Hokio, Levin

Te Papa Research Fellow Patrick Brownsey was recently contacted about a population near Levin of the very rare Ophioglossum petiolatum.

Ophioglossum are odd looking ferns, as befits a common name of “adder’s tongue ferns”.  We don’t have a picture of O. petiolatum (stalked adder’s tongue fern), but the related O. coriaceum is similar; O. petiolatum has a rounder leaf and a longer fertile spike than shown in the drawing below.

Ophioglossum coriaceum. Adams, Nancy. Purchased 2006. © Te Papa.

Ophioglossum petiolatum has a Nationally Critical conservation status in New Zealand.  More details and photos from the Plant Conservation Network.

Pat saw the Hokio population about 30 years ago, and wrote an article about it.  A local landowner wanted to know if the population still persisted.  Primary Science Teacher Fellow Wendy Hogg and I joined Pat for the hunt, but we were unsuccessful.  The area is much changed, and it seems unlikely (but not impossible) that O. petiolatum survives near Levin.  1985 article about Ophioglossum petiolatum at Hokio (2.3 MB pdf).

However, we did find the unusual, floating liverwort Ricciocarpos natans.  Although only a centimetre or two across, it is very distinctive.  It has a Nationally Endangered conservation status, but it is probably under-collected, and may be more common than appreciated.  Please look out for it amongst the “duckweed” on your local ponds!

The floating liverwort Ricciocarpos natans. Here it is ‘beach-cast’ in mud, along with Azolla rubra (a floating fern; the red plant in the lower-right corner) and Lemna duckweed (the small green ovals). Photo Leon Perrie, © Te Papa.

Poo moss

Tayloria mosses belong to the wonderfully named Splachnaceae family, and grow on dung and carcasses!

Such substrates are unusual for mosses, and Tayloria has several adaptations for its specialist life-style. 

Tayloria moss, near Riverton. Photo Leon Perrie, (c) Te Papa.

Mosses reproduce by spores, which in most cases are dispersed by the wind, and may or may not land in a suitable place for the spore to germinate.  The spores of Tayloria are sticky, so they adhere to flies and other animals attracted to the dung or carrion.  Moreover, the capsule producing the spores mimics the foul smell, attracting the visiting flies close to the spores.  In this way, Tayloria mosses increase their chances of dispersing from one dung heap (or dead body) to the next.

Some overseas Tayloria mosses are so specialised that the odour they emit is chemically tuned to the dung smell of a particular animal.

Anne Gaskett from the University of Auckland talking to Radio New Zealand’s Our Changing World programme about her research on Tayloria mosses.

New Zealand has three indigenous species of Tayloria mosses; look out for them!  Te Papa’s WELT herbarium holds c. 160 specimens.

Distribution map of Tayloria specimens held by Te Papa.

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