The Hirschzungen sinkhole has steep and partially overhanging walls. Its age is estimated at around 500 years. The collapse of the underlying karst cave took place in historical times.
The deer tongue is a fern that needs shady and moist steep slopes on limestone or gypsum soil. These requirements are very well met in the approximately 10 m deep sinkhole,

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Martl

May 9, 2021

Hiking

The deer tongue is a fern with a simple leaf and is considered rare. She loves soaked rock walls and subsoil with little soil. The northernmost deposit known to me is in front of Smoo Cave in northern Scotland. There is also a small stock growing in a column in the Roman Forum. There are several deposits in the gypsum karst area of the southern Harz.

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Martl

November 12, 2021

Hiking

With the surrounding vertical walls, this is a prime example of a sinkhole. Here is also the most impressive stag-tongue fern occurrence in the region that I know of. Sporadic occurrences occur again and again along the karst hiking trail, but they are not as noticeable as here in the sinkhole. Deer tongue fern is under nature protection.

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Informations

Elevation 270 m

Weather

Tuesday 5 May

14°C

9°C

72 %

Additional weather tips

Max wind speed: 8.0 km/h

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Location: Osterode, Osterode am Harz, Harz Mountains, Saxony-Anhalt, Germany

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Hart's-tongue fern sinkhole in Hainholz

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Karst Trail and View of Düna – Jetten Cave loop from Gipskarstlandschaft Hainholz

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Jetten Cave – Hainholz Gypsum Karst Landscape loop from Gipskarstlandschaft Hainholz

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Hainholz Gypsum Karst Landscape – Jetten Cave loop from Gipskarstlandschaft Hainholz

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