Stomates!

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Stomates/stomata are pores present on epidermis of plant parts that facilitate gaseous exchange. This pore is bounded by guard cells which are modified parenchyma cells that regulate size of stomatal opening.
Some playing with plants at home and one interesting plant at college led to these images.

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Stomata on leaves of Catharanthus roseus, same epidermal peel stained with 1% Methylene Blue

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As the name Excoecaria bicolor suggests, the plant has leaves with upper part green and lower part red. What must be the purpose of having a red bottom? Anyway, moving on to the images…


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Did not expect to see stomata in the fleshy onion bulb that we consume. The epidermis surely had things to offer. It is however expected to find stomata over there, since those are nothing but modified scale leaves!

So leaving behind questions for you all foldscopers. How’d stomata look like on other bulbs? Is it possible for one to use stomata to identify plants? How about setting up a ‘stomata database’?

2 Comments Add yours

  1. laksiyer says:

    Fantastic post. Love the Stomata on the onion epidermis. I have never seen any like this. Perhaps they are found only early in the development of the bulb? or perhaps the rest of us are not looking hard enough.

    1. Ronak Hati says:

      Though the bulb seemed to be fully developed. I wonder whether stomata would be visible on garlic too… however I do not have any with me at the moment. Would make a post in the future if I find one.

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