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The taxonomic position of Asterodon, Asterostroma and Coltricia inferred from the septal pore cap ultrastructure

Published online by Cambridge University Press:  17 January 2001

Wally H. MÜLLER ,
Joost A. STALPERS ,
Adriaan C. van AELST ,
Margo D. M. de JONG ,
Theo P. van der KRIFT  and
Teun BOEKHOUT
Wally H. MÜLLER
Affiliation:
Department of Molecular Cell Biology, EMSA, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands Centraalbureau voor Schimmelcultures, P. O. Box 273, 3740 AG Baarn, The Netherlands Yeast Division of the Centraalbureau voor Schimmelcultures, Julianalaan 67, 2628 BC Delft, The Netherlands
Joost A. STALPERS
Affiliation:
Centraalbureau voor Schimmelcultures, P. O. Box 273, 3740 AG Baarn, The Netherlands
Adriaan C. van AELST
Affiliation:
Department of Experimental Plant Morphology and Cell Biology, Agricultural University of Wageningen, Arboretumlaan 4, 6703 BD Wageningen, The Netherlands
Margo D. M. de JONG
Affiliation:
Department of Molecular Cell Biology, EMSA, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
Theo P. van der KRIFT
Affiliation:
Department of Molecular Cell Biology, EMSA, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
Teun BOEKHOUT
Affiliation:
Yeast Division of the Centraalbureau voor Schimmelcultures, Julianalaan 67, 2628 BC Delft, The Netherlands
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Abstract

The ultrastructure of the septal pore cap (SPC) of Asterodon, Asterostroma and Coltricia were examined to establish the taxonomic position of these genera. Asterostroma has dolipores with perforate SPCs and is classified in the Lachnocladiaceae. In contrast, Asterodon and Coltricia have dolipores with imperforate SPCs and belong to the Hymenochaetaceae. Other selected species of genera belonging to the Hymenochaetaceae like Hydnochaete, Coltriciella, Inonotus, Onnia, and Cyclomyces also contained imperforate SPCs. Coltriciella, Inonotus and Cyclomyces moreover presented a lamella of endoplasmic reticulum above the imperforate SPC after chemical fixation. Such a lamella could rarely be observed in Coltricia only after high-pressure freezing and freeze substitution. Cryofixed fungal cells of Cyclomyces and Coltricia showed differences in the architecture of the matrix of the SPC. Coltricia showed a more layered matrix structure than the SPC of Cyclomyces. In addition, transmission- and scanning electron microscopy revealed an indent in the centre of the imperforate SPC of Cyclomyces, indicating a reduced thickness, and resulting into a tented profile in cross-sections.

Type
Research Article
Information
Mycological Research , Volume 104 , Issue 12 , December 2000 , pp. 1485 - 1492
Copyright
© The British Mycological Society 2000

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