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Rhizines occasionally occur in the genus Hypogymnia (Parmeliaceae, Ascomycota)

Published online by Cambridge University Press:  29 January 2015

Xin-Li WEI ,
Kai CHEN ,
H. Thorsten LUMBSCH  and
Jiang-Chun WEI
Xin-Li WEI
Affiliation:
State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China. Email: weixl@im.ac.cn
Kai CHEN
Affiliation:
State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China. Email: weixl@im.ac.cn University of Chinese Academy of Sciences, Beijing 100039, China
H. Thorsten LUMBSCH
Affiliation:
Science & Education, The Field Museum, Chicago, IL 60605, USA. Email: tlumbsch@fieldmuseum.org
Jiang-Chun WEI
Affiliation:
State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China. Email: weixl@im.ac.cn
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Abstract

The genus Hypogymnia is morphologically characterized by swollen lobes, a hollow medulla, perforations in the lower surface, and the absence of rhizines. In our studies on Hypogymnia spp. we found rhizines and hapters were occasionally present on the lower surface of 35 species. Morphology and anatomy of the appendage-organs were studied using dissecting, compound, and scanning electron microscopy and compared with rhizines found in the related genus Arctoparmelia. Two types of rhizine-like structures were found in Hypogymnia: slender and elongated rhizines, and thick and short hapters, both of which were few in number and sparsely distributed on the lower surface. There are no obvious differences in the morphology of rhizines between Arctoparmelia and Hypogymnia, except that rhizines are abundant in Arctoparmelia. Within Parmeliaceae, Hypogymnia belongs to the hypogymnioid clade together with the genera Arctoparmelia, Brodoa, and Pseudevernia, most of which are considered to lack rhizines. The occurrence of rhizines in Hypogymnia is consistent with the placement of Arctoparmelia in the hypogymnioid clade based on molecular data.

Keywords

haptershypogymnioid lichenslichensmorphology
Type
Articles
Information
The Lichenologist , Volume 47 , Issue 1 , January 2015 , pp. 69 - 75
Copyright
Copyright © British Lichen Society 2015 

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