Plants in unlikely places: City living a bit of a drain

Albion Way grate fern. Photo by Gregor Richardson.
Albion Way grate fern. Photo by Gregor Richardson.
Anna Chinn looks at the surprising areas where plants are found around Dunedin.

What is it?
Hound's tongue fern, also kowaowao or paraharaha, or Microsorum pustulatum.

Native to Australia and New Zealand, it was among the botanical specimens collected on Captain Cook's 1769 voyage.

In this instance, the hound's tongue is growing behind bars, in a drain on Albion Lane, not far from the back of McDonald's.

How unlikely is that?
The fern is common in woodland, but a casual survey throughout central Dunedin did not find hound's tongue growing in any other drain.

Still, a drain evidently can provide enough moisture and shade for hound's tongue, which is used to having trees above it.

So how did it get there?
Most probably wind-blown spores, possibly from established colonies in the Town Belt.

Ferns release thousands of these individual cells, and most of them amount to nothing.

But some survive long enough to find a moist situation where they can germinate and feed off their environment in order to grow.

University of Otago botanist John Steel said: "Spores are so small, they have very small chances of survival.

They need to find a hospitable environment relatively quickly."

Music may also have helped this particular plant along.

For reasons of its own, the nearby McDonald's regularly plays classical tunes by the likes of Tchaikovsky and Wagner through speakers outside the store's rear entrance.

A Korean study published in New Scientist magazine in August 2007 found the sound waves produced by classical music could increase the activity of certain plant genes associated with growth.

When was it spotted?
In February, although Mr Steel said, "It looks like it could have been growing there for a few years."

Is it still there?
Yes.

 

Add a Comment

 

Advertisement

postanote_header_620_x_80.png

postanote_620_x_25.jpg

Local journalism matters - now more than ever

As the Covid-19 pandemic brings the world into uncharted waters, Otago Daily Times reporters and photographers continue to bring you the stories that matter. For more than 158 years our journalists have provided readers with local news you can trust. This is more important now than ever.

As advertising drops off during the pandemic, support from our readers is crucial. You can help us continue to bring you news you can trust by becoming a supporter.

Become a Supporter