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Lichens Lichens

Overview

A lichen is a symbiotic partnership between a fungus and an alga or a cyanobacterium. The classification is based on the fungal partner and lichens are often referred to as lichenized fungi. The fungal partner may produce sexual spores and the most commonly seen spore-producing structure is the apothecium, usually circular and somewhat saucer-like. In a number of lichens the production of fungal spores is rare (or even unknown) so that only the vegetative component, or thallus, is present. Lichen thalli show various growth forms and the common types found locally are fruticose, crustose, foliose and squamulose. Fruticose lichens are erect or pendulous and markedly three-dimensional. Examples already on CNM are Cladia and Usnea. Crustose lichens are markedly two dimensional and firmly attached to the substrate by their entire lower surfaces, making it impossible to see a crustose lichen's undersurface. A crustose lichen looks very much like a thin crust on the substrate and examples on CNM are Buellia and Caloplaca. Foliose lichens could be thought of as halfway between crustose and fruticose. Though obviously three dimensional they grow in a more-or-less sheet-like form, but often with a lobed appearance. They are not attached by their entire lower surfaces to their substrates. Indeed, some foliose lichens are just centrally attached to their substrates with the rest loose, so making it possible to see both the lower and upper surfaces very easily. On CNM you will find examples in the family Parmeliaceae. Squamulose lichens grow as aggregations of small scales, from which the sporing structures may be produced. Examples already on CNM are the genera Cladonia and Thysanothecium. Fruticose, crustose, foliose and squamulose are useful descriptive terms, not precisely defined taxonomic categories, and there are also other types of growth forms. Lichen expertise: Canberra Nature Map currently has no lichen expert on call. Heino, whose main interest is fungi, is able to identify a number of lichens to some degree but will be unable to say anything about most of the local lichens, even when superb photographs are presented. Hence, he is likely to reject many photos, rather than have them sit indefinitely in 'Unidentified sightings'.

Further information: http://www.cpbr.gov.au/lichen/index.html

Page 2 of Lichens - 34 species

Lichen Lichenomphalia chromacea (Yellow navel)

Lichenomphalia chromacea
Lichenomphalia chromacea
Lichenomphalia chromacea
Lichenomphalia chromacea
Lichenomphalia chromacea
Lichenomphalia chromacea

Lichen Parmeliaceae (A lichen family)

Parmeliaceae
Parmeliaceae
Parmeliaceae
Parmeliaceae
Parmeliaceae
Parmeliaceae

Lichen Peltigera (A foliose lichen)

Peltigera
Peltigera
Peltigera
Peltigera
Peltigera
Peltigera

Lichen Pseudocyphellaria sp (A Speckled-belly Lichen)

Pseudocyphellaria sp
Pseudocyphellaria sp
Pseudocyphellaria sp
Pseudocyphellaria sp
Rhizocarpon geographicum
Rhizocarpon geographicum
Rhizocarpon geographicum
Rhizocarpon geographicum
Rhizocarpon geographicum
Rhizocarpon geographicum

Lichen Teloschistes sp. (A lichen)

Teloschistes sp.
Teloschistes sp.
Teloschistes sp.
Teloschistes sp.
Teloschistes sp.
Teloschistes sp.

Lichen Thamnolia sp. (A whiteworm lichen)

Lichen Thamnolia vermicularis (Whiteworm Lichen)

Thamnolia vermicularis
Thamnolia vermicularis
Thamnolia vermicularis
Thamnolia vermicularis
Thamnolia vermicularis
Thamnolia vermicularis

Lichen Thysanothecium scutellatum (A squamulose lichen)

Thysanothecium scutellatum
Thysanothecium scutellatum
Thysanothecium scutellatum
Thysanothecium scutellatum
Thysanothecium scutellatum
Thysanothecium scutellatum
Usnea scabrida
Usnea scabrida
Usnea scabrida
Usnea scabrida
Usnea scabrida
Usnea scabrida

Lichen Usnea sp. (Old man's beard)

Usnea sp.
Usnea sp.
Usnea sp.
Usnea sp.
Usnea sp.
Usnea sp.
Xanthoparmelia semiviridis
Xanthoparmelia semiviridis
Xanthoparmelia semiviridis
Xanthoparmelia semiviridis
Xanthoparmelia semiviridis
Xanthoparmelia semiviridis

Lichen Xanthoparmelia sp. (A foliose lichen)

Xanthoparmelia sp.
Xanthoparmelia sp.
Xanthoparmelia sp.
Xanthoparmelia sp.
Xanthoparmelia sp.
Xanthoparmelia sp.

Lichen Xanthoria sp. (A lichen)

Xanthoria sp.
Xanthoria sp.
Xanthoria sp.
Xanthoria sp.
Xanthoria sp.
Xanthoria sp.

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