International Aroid Society

Thank you, Tom! That does look right; this image of Dicranopygium yacu-sisa (there is no "h" in it) looks very much like what I saw in Ecuador. (Not to say mine was the same species, but the genus seems right.)

http://commons.wikimedia.org/wiki/File:14880-Dicranopygium_yacu-sisa-Tabaro.jpg

Jason Hernandez

Naturalist-at-Large

Date: Thu, 14 May 2015 22:11:53 +0000
From: Tom Croat <Thomas.Croat@mobot.org>
Subject: Re: [Aroid-l] Fenestratarum culum P.C.Boyce & S.Y.Wong
To: 'Discussion of aroids' <aroid-l@www.gizmoworks.com>
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Dear Jason: Actually there appear to be several species that at rheophytes. I have always called them Dichranopygium but I could be wrong.

Tom

From: aroid-l-bounces@www.gizmoworks.com [mailto:aroid-l-bounces@www.gizmoworks.com] On Behalf Of Jason Hernandez
Sent: Wednesday, May 13, 2015 11:31 PM
To: aroid-l@www.gizmoworks.com
Subject: Re: [Aroid-l] Fenestratarum culum P.C.Boyce & S.Y.Wong

Speaking of Rheophytes:
I have not yet had the opportunity to look up that key to the Cyclanthaceae (thank you for providing the citation), but one of the reasons I asked was because I remember seeing a rheophytic cyclanth in Ecuador, but was not able to determine, from online sources, what genus it could be. Anyone familiar with this? It was on the Pacific slope, about 10-12 cm in height when full grown, white inflorescences, and grew over emersed rocks with roots trailing in the water.

Jason Hernandez
Naturalist-at-Large

Date: Wed, 13 May 2015 11:10:22 +0800
From: Peter Boyce <phymatarum@gmail.com<mailto:phymatarum@gmail.com>>
Subject: Re: [Aroid-l] Fenestratarum culum P.C.Boyce & S.Y.Wong
To: Discussion of aroids <aroid-l@www.gizmoworks.com<mailto:aroid-l@www.gizmoworks.com>>
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Hi Cory,

Streamlined leaf blades are widely associated rheophytism and with aquatic
plants - indeed before the term 'rheophytism' was coined by van Steenis,
Ridley, who termed it ?stenophylly?, mentioned the ecological nice and its
adaptations in "On the Flora of the Eastern Coast of the Malay Peninsula -
[Transactions of the Linnean Society of London. 2nd series, Botany 3(10),
267-408].

By the way, the "wider" leaf blade in the image is an undescribed *Aridarum*,
also a rheophyte, and these blades still classify as narrow.

This is a nice paper dealing with morphological adaptations associated with
rheophytism:

http://www.aroid.org/gallery/wong/Rheophytism%20in%20Bornean%20Schismatoglottideae%20-%20%5BSystematic%20Botany%2038%281%29%2032-45%5D%20-%20Wong%202013.pdf