![](https://nthumb.tpgimages.com/mid2_com_img/1339/7976/TOP10167926.jpg)
Map lichen (Rhizocarpon geographica) growing on a granite gravestone. This type of lichen is known as saxicolous lichen as it grows on or among rocks. A lichen is a mutualistic organism comprising an alga and a fungus that live in a mutually-beneficial relationship. The alga produces carbohydrates for the fungus by photosynthesis, and the fungus protects the alga from harsh conditions. Lichens are highly sensitive to pollution: several are used as indicator species for sulphur dioxide levels in the atmosphere.
px | px | dpi | = | cm | x | cm | = | MB |
Details
Creative#:
TOP10167926
Source:
達志影像
Authorization Type:
RM
Release Information:
須由TPG 完整授權
Model Release:
N/A
Property Release:
N/A
Right to Privacy:
No
Same folder images: