Radial structures in the stomata of Ouratea (Ochnaceae) – (in German)

 

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Ouratea spectabilis

Radialstrukturen in den Stomata von Ouratea spectabilis (Mart.) Engl.

by Arens T. (1968)

Thusnelda Arens

Cadeira de Botânica da Faculdade de Fil.Est. de São PauloBrasil

in Protoplasma (Wien) 66: 403-411 –

https://link.springer.com/article/10.1007/BF01255867

Zusammenfassung

An den lebenden unbehandelten Spaltöffnungen von Ouratea spectabilis wurde eine vom Spalt ausgehende Radialstruktur beobachtet.

Dieselbe läßt sich mit verschiedenen Farbstoffen darstellen und ist nicht mit einer Cuticularstreifung identisch.

Es handelt sich um Ektodesmen, die infolge ihrer besonderen Eigenschaften (Größe usw.) ohne Anwendung spezieller Methoden sichtbar sind.

Mit der Methode von Bancher, Hölzl und Klima läßt sich zeigen, daß aus ihnen Flüssigkeitströpfchen abgeschieden werden können.

Mit dem Transpirationswasser aufgenommene Salze (Thallium und Mangan) reichern sich im Zellumen und in diesen Ektodesmen an.

Sie sind offenbar die Bahnen der peristomatären Transpiration.

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Radial structures in the stomata of Ouratea spectabilis (Mart.) Engl.

 

Summary

In living, untreated stomata of Ouratea spectabilis a radial structure originating in the stomatal opening was observed, which may be demonstrated by means of various stains.

It is not identical with a cuticular striation.

These structures are shown to be ectodesms visible without use of special methods because of their peculiar properties (size etc.).

The method of Bancher, Hölzl and Klima allows to demonstrate that these ectodesms may secret fluid droplets. Salts (thallium and manganese) taken up with the transpiration stream are concentrated in the cell lumen and in the ectodesms. Obviously, the ectodesms are the pathways of peristomatal transpiration.

Diacytic stomata in the Nelsonioideae (Acanthaceae)

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Nelsonia campestris

IMG_7163
Staurogyne zeylanica Kuntze – https://08511630493324166816.googlegroups.com/attach/836ccffa714d9eb8/IMG_7163.jpg?part=0.1&view=1&vt=ANaJVrHMX5IttDk0NUD664jw0rZB8913EbPdeoOREhA-b5XurMV0ZYKJU3PgRGahRjwHSf8Eh7W4HKGjJrLu6lGi_1YxFyddxkQ_wEWwat9FqKLvuqhVT5c

 

Cuticular studies in some Nelsonioideae (Acanthaceae)

by Ahmad K. J. (1974)

KHWAJA J. AHMAD

in Bot. J. Linn. Soc. 68: 73-80 – DOI: 10.1111/j.1095-8339.1974.tb01748.x – 

http://onlinelibrary.wiley.com/doi/10.1111/j.1095-8339.1974.tb01748.x/abstract

This paper represents a modified portion of a thesis accepted for the Ph.D. degree by the University of Lucknow.

Abstract

The foliar epidermis and cuticle of Staurogyne longifolia (Nees) Kuntze, Elytraria acaulis (L.f.) Lindau var. acaulis, E. acaulis var. lyrata (Nees) Bremek. and Nelsonia campestris R.Br, have been investigated, revealing broad similarities with those of the rest of the Acanthaceae;

the presence of diacytic stomata in the Nelsonioideae is evidence of its affinity with the Acanthaceae in general, while the presence of panduriform glandular hairs and the absence of the cystoliths in Nelsonioideae indicate its particular affinity with the Thunbergioideae.

Substantial evidence is provided to support the retention of Nelsonioideae as a subfamily of the Acanthaceae, rather than its transfer to the Scrophulariaceae.

 

Little known features in the epidermis of some Euphorbiaceae

 

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Sebastiana chamaelea

Little known features in the foliar epidermology of some Euphorbiaceae

by Rao P. N., Raju V. S. (1975)

Andhra University, Waltair, India

Piratla Narasimha Rao, V. Satyanarayana Raju

in Curr. Sci. 44: 750-752

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