International Aroid Society

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Hello Don,

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Look at these photos and imagine that the cord is a leaf =0Ain cross section, while the node is the midrib.

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No. 1 shows the involute vernation, both halves of =0Athe leaf are rolled independently. This is observed in the genus =0ALagenandra, but not only, what confirms the photo of Amophophallus bulbifer =0Aleaflet unfolding involutely which I sent in the prevoius message.

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No. 2 is the most common type of vernation in =0AAraceae, it was depicted in the photo of Zantedeschia leaf I sent =0Apreviously. as I know a little Latin, I would call it supervolute. "Super" =0Ameans "over" "above". One half of a leaf is wrapped by the other half, the =0Ainternal half remains rolled until the wrapping half unfolds.

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One half is rolled clockwise, the other one is =0Arolled counter-clockwise (looking from the midrib).

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No. 3a, 3b, 3c is the problem. "Con" means =0A"together". In this case both halves are in the same roll, paralelly unfolding =0Ain the same direction by contrast to the type 2. This is what I would call =0Aconvolute, I haven't observed this in aroids yet, however it is =0Apossible.

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Marek

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----- Original Message -----
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From: =0A Don =0A Bittel
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To: Discussion of aroids
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Sent: Friday, January 15, 2010 6:04 =0A AM
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Subject: Re: [Aroid-l] Supervolute =0A vernation. Finally a photo!
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I have always thought that convolute and supervolute vernation =0A were the same thing. That is, that the left side is wrapped around the right =0A side, which is wrapped around itself. Or vice versa, with right around the =0A left. Most aroids are this way. =0A

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The Pachyneurium anthuriums are involute, looking like two tubes side by =0A side. This includes the common birdnest types, as well as some heart shaped =0A leaves, like standleyi and watermaliense. Aren't there just these two =0A types of vernation?
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You mention that most of the plants sold as hookeri are hybrids. I think =0A that most are true species of pachyneurium types, and if hybrids are certainly =0A not hybrids of hookeri, but are hybrids of schlectendallii or crispamarginata =0A or other common birdnest types.
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And in your last paragraph, you write about scalariform VERnation, which =0A should be scalariform VEnation, referring to the vein structure of the leaf. =0A Just a typo, but confusing to the subject at hand.
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shivering in south florida,
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Don Bittel
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Wed, 13 Jan 2010 15:02:44 -0600
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From: Steve@exoticrainforest.com
To: =0A aroid-l@gizmoworks.com
Subject: [Aroid-l] Supervolute vernation. Finally a =0A photo!

There are several types of leaf vernation when a new =0A leaf first emerges. Vernation is simply the way a new leaf blade is rolled or =0A folded as it begins to emerge from the cataphyll.

Although there are =0A several forms of vernation in aroids the most common type is known as =0A convolute vernation which describes the edges of a newly unfurling leaf blade =0A which have both margins (edges) curled inward wrapping around each other. This =0A is observed when the new blade emerges from the cataphyll and the wrapping of =0A one margin is rolled over the other. The mechanism makes the emerging leaf =0A present itself as a tube.

The second is known as involute vernation and =0A is observed when a newly developing leaf emerges from the cataphyll when both =0A margins (edges) on opposing sides of the leaf blade are rolled forming two =0A inward facing tubes that meet at the midrib of the leaf. This type is not as =0A common as convolute vernation.

The least common is known as supervolute =0A vernation. I have been working for weeks to complete an article for the next =0A issue of Aroideana (the journal of the International Aroid Society) to be =0A published in August. That article attempts to make many of the terms used in =0A scientific literature easy for a collector to understand and use. One of the =0A most difficult definitions to write was the one for supervolute vernation =0A since a definition did not exist in any of the scientific texts or journals I =0A own. I couldn't even find a definition on the internet and the definition I =0A found on the internet for "supervolute" was impossible to understand. Look it =0A up and see if you can figure out what they are trying to say!

Finally =0A my friend Leland Miyano sent a photo of a newly emerging leaf of Anthurium =0A hookeri and the definition Dr. Tom Croat helped to clarify suddenly became =0A crystal clear. Until I received this photo I had no real idea what supervolute =0A vernation really meant.

supervolute vernation
Possessing a =0A convolute arrangement in the folding or arrangement of a newly emerging leaf =0A blade with one margin (edge) of the newly blade emerging rolled inward toward =0A the midrib and the opposite margin rolled around the midrib as well as the =0A remainder of the leaf in a manner similar to the coiled whorl at the end of a =0A conch shell.

My thanks to Leland for the photo!

If you =0A believe you are growing Anthurium hookeri you may want to look at this =0A page! I have been trying to find a specimen for years and so far have =0A never been able to buy one since all the plants available for sale are not the =0A species but instead are a hybrid.

If the plant doesn't have =0A scalariforme (ladder-like) vernation, glandular punctates (tiny black spots) =0A on the back of the leaf, and produces white berries on an inflorescence =0A instead of the read ones everyone believes the species should produce it isn't =0A the real Anthurium hookeri.

http://www.exoticrainforest.com/Anthurium%20hookeri%20pc.html

Steve
www.ExoticRainforest.com

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