Category Archives: Flora

Crystal clear emerald-tinged pools

Crystal pool

Crystal pool

We often describe Dartmoor as holding a rugged beauty and for the most part that remains true and helps us appreciate the harshness of some of the environment. Every now and again Dartmoor offers something new to the eye, something unexpected, perhaps only for a short period in time, just like these crystal clear emerald-tinged pools.
This pool found at Holne Moor SX 675698 is approximately one metre deep and is alive with flora found in only the healthiest of wild water features.
It is in an old tinning excavation and continuously fed with fresh water from the moor it has managed to avoid becoming peat-stained.

Sundew

The Sundew plant Drosera Rotundifolia feeds on insects that have been attracted to the glistening drops of mucilage on its spiney red leaves. The droplets covering the leaves are loaded with a sugary substance however the stickiness is overwhelming for the small insects it attracts. Enzymes dissolve the insects in situ and nutrients are obsorbed into the foliage.

Sundew have developed their carnivorous behaviour to substitute for the lack of nutrients of their chosen environment, namely damp acidic soil, marshes and blanket bogs. The insects provide the necessary nitrogen and other nutrients missing from such soils.

Sundew - Drosera Rotundifolia

Sundew – Drosera Rotundifolia

This example was found close to a tributary of the river Walkham on South Dartmoor. This section often floods leaving the area squelchy in all but the driest summers.

Devil’s Matchsticks

My favourite lichen find on Dartmoor is always the: Devil’s Matchstick – Cladonia floerkeana – or – Florke’s Cup Lichen.

This example was found on a rough weathered boulder on the north side of Lower Hartor Tor. They appear to like to find a small niche or crevice that provide them both protection and a source of mositure.

A lichen is a compound organism comprising a fungus, an alga and sometimes a cyanobacterium, co-existing in a mutually beneficial partnership. The algae and/or cyanobacteria are protected from the environment by the fungal body, and the fungus receives nutrients from the algae which are produced by photosynthesis. The cyanobacteria also have the ability to fix nitrogen. This complex relationship enables lichens to colonise a very wide range of habitats.