Earth-stars (Geastrum triplex) in Cumbria

December 2013:
A small deciduous coppice close to the waxcap site (mentioned earlier) in northern Cumbria had the Collared Earth-star (Geastrum triplex). These spectacular fungi, whilst widespread in Britain, are also quite scarce. As the fruiting bodies develop in the autumn, an outer covering initially protects the rounded fruiting sac inside but on maturity this opens out forming a series of retracted rays to reveal the inner sac. As rain falls on the newly exposed sac or the wind disturbs it, spores are released through the central orifice. A pale area around the orifice helps to distinguish it from species of other similarly-sized earth-star. These were found in leaf litter and are not easy to see initially.

Prior to opening

 

Rays now expanded

 

 





FUNGUS: Some gasteroid fungi in north-west England

September 28-October 4, 2010:
'Gasteroid' is a loose term used to describe fungi in which the spores are developed within the closed fruitbodies. The result is that the spores are not forcibly dicharged but are released passively often through a central hole (ostiole) by the aid of external agents such as wind or falling rain drops. The group includes those fungi well-known as puffballs, earthstars, etc. Dunes and woodlands are typical habitats with those at Ainsdale NNR near Southport being especially rich. A few seen and photographed recently are shown here.


[Dunes at Ainsdale]

Lycoperdon perlatum, Common Puffball, (below) occurs either singly or in small clusters and has its outer surface delicately covered with fine spines or 'pearls'. It is widespread in Britain and very common at Ainsdale where photographed here.





[Fruitbodies from which the spores have been expelled]


[Above, probably the closely-related Lycoperdon nigrescens, Ainsdale dunes]

Lycoperdon excipuliformis, Pestle-shaped Puffball (below) also occurs at Ainsdale but less frequently. It mainly differs from the above in its shape as suggested by its common name. It is more elongated and taller than L. perlatum.


[Lycoperdon excipuliformis at Ainsdale]

Lycoperdon pyriforme, Stump Puffball, is common throughout the country and grows in woodland on strongly-decaying wood. Photographed below at Eaves Wood, Lancashire in 2008.


[Lycoperdon pyriforme]

Scleroderma citrinum, Common Earthball, (below) is tinged yellowish and has coarse scales or warts on its outer surface. It favours acidic woodlands and heaths and is often associated with birch, beech or oak. Here it was growing amongst scattered birch on the heath at Foulshaw Moss, Cumbria.



[Scleroderma citrinum]

Geastrum triplex, Collared Earthstar, is probably the commonest species within the genus. The expanded fruit body splits into several arched rays to reveal the onion-shaped central body. Often found on dunes or in calcareous woodland as here at Silverdale.


[Geastrum triplex]

FUNGUS: Collared Earth-star (Geastrum triplex) at Silverdale, Lancashire

October 8, 2008:
Collared Earth-star is a locally scarce fungus of quite striking appearance with its bulbous spore sac on a raised roughly star-shaped base. This is due to the rays splitting transversely and opening outwards. It is an autumn-flowering fungus and usually occurs amongst leaf litter in deciduous woodland, as here.





Having an aperture at the apex of the spore sac, any slight disturbance or even falling rain will cause the mature spores to be expelled. There are several species of Geastrum in Britain, many of them rare. Although uncommon, this is one which is more frequently met.