A very rare moss was found near a construction site – the tiny plant found a new habitat, but there is no guarantee that it will be saved

Rotten hoof moss grows in rot.
Decaying oak moss grows on the surface of decaying trees. It is about 2 cm high. Archival photo.

A decaying caviar frog, classified as critically endangered, was found in a tree stump. However, it did not prevent construction work.

In Kotka, near the new primary school in Karhula, a frog has been found that is classified as critically endangered.

Construction work on the Karhula primary school started this week. The contractor says that moss had been found on the site in one of the stumps.

– It remains to be seen how successful it will be,” says Laurikainen.

A construction site area with sprouts and a gray container.
Work started this week on the construction site of the new primary school in Karhula.

Moss resembling a caviar

In the summer of 2021, a nature survey was carried out in the area. It was then discovered that in the spruce forest on the west side of the sports field, germinal clusters of the highly endangered rotted hoof moss were found on one of the tree trunks.

Performances all over Finland

According to the nature survey carried out last year, the germinal grains of rotten hoof moss have been mapped in various parts of Finland in recent years.

Lahokaviosamma has been found in abundance in places such as Vantaa, Tampere and Kuopio. It has also been found, for example, at the construction site of the Pirkkola sports hall in Helsinki.

The number of known occurrences of Lahokavio moss has grown explosively, and the known range has expanded considerably further north than previously known.

– At the same time, it has been observed that sprouts also occur in places that, according to the previous understanding, do not meet the growth site requirements of the species at all. They have been observed e.g. in young economic forest birches on the trunks, on the stumps of the spruces belonging to the previous tree generation, says the report.