More polytrichum! (Commune)

I was thinking over this entry (and the previous one) earlier and I realised something -- the word "Polytrichum" isn't necessarily an easy word to read and then pronounce correctly.  So, for the record, it's pronounced "politrickum" -- or at least, in the UK it is.

The second moss we saw at Abbot's moss was Polytrichum commune.  It's common names include Common Haircap Moss, Common Hair Moss and Great Goldilocks.   These species of moss are called hair mosses because because the spore producing part of the moss (sporophyte) has hairs that stick out from the protective hood that covers the spore case (the calyptra).  The word "calyptra" is medieval Latin, from the Greek word "kaluptein" (to cover).

Common Haircap Moss is bigger than Juniper Haircap -- in fact, it can grow up to 28 inches long, though usually it reaches anywhere between 2-12" long and looks far more "bottle brushy" than the Juniper Haircap:

Other differences include toothed leaves with parallel sides.  It also has brown leaf tips.

It's found throughout the more temperate areas of the Northern Hemisphere and grows in heathlands and bogs.  It also grows in Australia and New Zealand and has been found woven into the fabric of Maori cloaks.  It's other uses include being made into doormats and brushes in Sweden and being used for bedding and quilting by Linnaeus himself -- and he would not be alone in doing this in the late 1700s!  Oil from the plant was used as a rinse for hair in addition to it teas being made to relieve gall bladder and kidney stones. 

Finally, baskets made of Common Haircap have also been found, though these were baskets made by Romans in around 86AD in Newstead, England:

I found this in a digitised version of a book written in 1911 by a chap named Curle.  He also writes "The stems of this moss are commonly a foot to eighteen inches long, and often attain a length considerably greater. The central stele, when cleaned, forms, as I have proved for myself, a tough pliable strand easily plaited, and quite suitable for the formation of such articles as baskets. When freshly cleaned, the core has a reddish colour and glossy surface, and basket-work of the material would not only be quite strong, but would, at least at first, have an attractive appearance."

He also notes that the tradition of doing this was probably pre-Roman.  If you want to read more, the digitised version of the book is here:  http://www.curlesnewstead.org.uk/index.htm

The Two Types of Moss

On the training day at Abbot's Moss, Martha showed us several plants, mosses and one liverwort (which sadly I couldn't take a picture of due to my camera battery dying).  All mosses can be divided into two types of moss -- acrocarpous and pleurocarpous mosses.

It all sounds dead complex, but it's not.  Simply put, acrocarpous and pleurocarpous are both "new Latin" terms (i.e. they come from Greek, but got Latinised for use in science terminology, in this case, in the late 1800s).  Carpous (or carpus) comes from the world karpos, which means "fruit", so it's all about where the fruiting bodies of the moss actually lie.

Acro (or Akro) means beginning, top or summit.
Pleur (or Pleuro) means "of or relating to the sides" (Merriam-Webster and dictionary.com).

So whether or not a moss is acrocarpous or pleurocarpous is simply a case of whether its fruits appear at the top or at the sides of the moss.  This dictates how the mosses grow:  Acrocarpous mosses don't have branches.  Pleurocarpous mosses do.  That's about the size of it.  No, really.

The first moss that we spotted was an acrocarpous moss, specifically Polytrichum juniperinum (many haired and a bit like juniper, or so Carl Ludwig Willdenow thought when he named it in the late 18th to early 19th century...).  It's commonly called "Juniper Haircap Moss".  Polytrichums tend to look a bit like bottle brushes, which you can see below:

The leaves of this moss have rolled margins rather than teeth.  The leaf tips are brown and the leaves themselves clasp the stem.  The brown leaf tips are what distinguishes it from other Polytrichum species.  This specimen had rhizoids that were evident at the base of the stem, though I'm not sure you can see them in the picture.  They look like roots and from what I gather, are basically the moss equivalent.  Part way through examining the moss, the leaves started to close up towards the stem -- so we sprayed it with water and the leaves unfurled again, which was pretty cool as you could watch it happen.   This plant has male plants and female plants too, though this one is a bit too young to tell, I think.

The cool thing about this moss is that it grows on every single continent -- including Antarctica.  It's just a little bit sturdy and doesn't mind a bit of disturbance or exposure.  In fact, it thrives in those areas and areas that are dry, nutrient poor and acidic, but it'll happily grow elsewhere too.

According to Lakehead University (Ontario), herbalists in the past used this as a diuretic for conditions such as dropsy, kidney stones and gallstones -- mostly because it could be used indefinitely without causing nausea.  Source:  http://www.borealforest.org/lichens/lichen10.htm).

I'm so glad we've got modern medicine...