The well-known Lunan Stone Forest National Park is located at 24^o49'N and 103^o19'E, 85km southeast of Kunming, provincial capital of Yunnan, China. Lunan Stone Forest covers a total area of some 350km². It is not only a great tourist attraction, being acclaimed as "one of the greatest natural wonder in the world", but also of important scientific and aesthetic value. The Lunan Stone forest is referred to in many published papers, but few involves microbe on the surface of carbonate rock there and the relationship of the microbe and formation of Lunnan Stone Forest Landscape.

Based on the field survey and laboratory observation on the microbe on the carbonate rock surface in Lunnan Stone Forest, it is found that microbe, mainly consisted of algae, lichen and fungi, forming a layer generally 0.5-3mm thick, covers nearly all parts of "bare rock" in Lunan Stone Forest. Normally over 90 percent of microbe coating are algae community with species of Chroococales (belong to Cyanophyta, Cyanophyceae, Chroococcales), and secondly species of Rivulariaceae, Scytonemataceae, Nostocaceae (belong to Cyanophyta, Cyanophyceae, Hormogonales), and some species of Chamaesiphonales (belong to Cyanophyta, Cyanophyceae ). Over 180 species aerial algae were identified on the surface of limestone and dolomite stone in Lunan Stone forest area, which is probably one of the most systematic identification of aerial algae community on limestone surface.

Meanwhile, the algal genetic effect on the formation of micro relieves and minor relieves of Lunnan Stone Forest landscape were also identified and studied. Cyanophyta, through the boring effects and related stripping effects, lead to the formation of micro and minor relieves on the surface of Stone Forest. These micro and minor forms include scale-like karren and photo-oriented spitkarren on limestone cliffs, round pit, irregular pit on both top and walls of limestone surface. It is also suggested that the algae solution pans and solution troughs. On the other hand, Cyanophyta participate in the formation of tumor-like calcareous tufa on a few parts of surface of Lunnan Stone Forest.

Cyanophyta plays an important role in the formation of beautiful Lunan Stone Forest landscape. It include two aspects as below:

1. Cyanophyta, forming algal coating with biokarst erosional agent, reduces greatly the hardness of surface of carbonate rock, generate a series micro and minor biokarst erosional relieves and promote karst solution process of Lunan Stone Forest landscapes, with directly related forms like karrens in micro and minor scales, and also with meso-scale forms such as pinnacle stone forest, tower stone forest and mushroom stone forest etc. In fact, algal coating even play a critique role in the genetic process of some "free" karren like rillenkarren.
2. Organic coating of Cyanophyta community dyes the surface of Lunan Stone Forest and forms the dyeing strip. When it is rainy with wetted algal coating, the surface colour becomes darker, while it is sunny with drought coating, the surface colour become light. Therefore, surface color of Lunan Stone Forest can be changed while the weather change, which become a unique landscapes attraction enjoyed by visits.