Wednesday, November 24, 2010

Dipterocarp walk at MacRitchie Part 2

In this 2nd post of last Sunday’s walk, let me just recap back to the beginning about it, since I had left that out in my 1st post.

Organised by the Plant Group of NSS, I joined this walk in keen anticipation to learn more plants. Primary forest flora are definitely not my forte, so its great that this walk came along.


The crowd was much more than what I expected, but then this was the 1st plant walk I attended.


And I guess it is also because of Dr Shawn Lum’s undeniable charm.

After a brief introduction about some of the dipterocarp genera that we can see today, we headed into Lornie Trail.


The first species we saw was this Anisoptera megistocarpa. He mentioned that the secondary veins of this genus are looped at the margins, evident from the picture below.


Just for interest, the common name of this species is Mersawa merah.


The second dip we were introduced to was the Keruing gombang merah, or Dipterocarpus kunstleri. This genus have leaves that are wavy are the margins and bears some resemblance to a piece of corrugated cardboard.


He told us the sad story of an adult Dipterocarpus kunstleri which died. However, its presence is still marked its many small baby trees like the two above.


I had heard about the big stipules of Dips but I never knew they were this large! I believed that this one belonged to Dipterocarpus kunstleri. We can see them scattered throughout the forest floor around the tree.


Shorea species have a twisted petiole compared to the other dips. The one above shows Shorea ovalis, a member of the Red Meranti group. It is rough on the underside.


Managed to take a picture of the tree.


And branches.


This leaf belonged to Shorea macroptera, the underside of this is smooth and seems to have a distinct in-rolling along the margins.


This is Shorea pauciflora. Note the twisted petiole in all the 3 Shorea species.


The large trunk of Shorea pauciflora marks the end of our walk. I had missed out three species as I had no good photos of. Will do that another time when I come here another day.


It was really a nice morning walk with new knowledge gained. Luckily I was not that lazy that day to wake up early!

I have blogged about most of the species learnt during this walk in the total vascular of Singapore online, so that you may have a quick and easy search in case anyone need to refer. :)

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