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Mosses

Mosses
 

Mosses:

  • Represent an evolutionary step up from algae. 
  • They have no roots and no system of woody vessels which allow more advanced plants to grow tall. 
  • As the first land plants mosses probably created the first forests, mini-ecosystems just 5cm or so high. 
  • They achieve this impressive height simply by packing themselves tightly together.
  • The sex life of mosses resembles the complicated system of alternate generations found in algae. 
  • Mosses keep the next generation at home, whereas algal male and female cells meet by swimming freely through the water.
  • O-moss cells are attached firmly to the parent plant. 
  • When they have been fertilised by free-swimming male cells they grow into spore-filled capsules on the end of long stalks. 
  • These capsules eventually open to release the spores which are blown away to grow into new moss plants.
  •  In some respects, this tendency to retain the female egg on the parent plant resembles the habit of later plants, such as cycads, conifers and flowering plants, to do the same. 
  • Perhaps it represents a step along the evolutionary way.

Additional Information:

  • The mosses, hornworts and liverworts all come under the general classification of 'bryophytes'.

  • They are usually considered the simplest of those organisms that are actually included in the Plant Kingdom.

  • They are usually only a few cells thick in structure, and have no efficient system of controlling or moving water within or without their body, as do all the other higher vascular plants.

  • Thus bryophytes can only grow in very moist places. In the Australian tropical rainforest they can be seen on rocks and logs, often in gullies and around creeks.

  • While they are common here, they appear to be even more dominant in cooler rainforests, such as those of the Atherton Tablelands and   even more so in the temperate rainforests further south, such as in Tasmania.

  • There are some 950 species so far recorded in Australia, with about 400 of them found in North Queensland (Jackes and Cairns 2001).

  • From a distance, bryophytes appear only as a carpet of soft green moss.

  • Close up, they look like tiny individual plants. Generally, they all have small green leaves, above which they project a sporophyte (above left), which consists of a stalk with a container at the end that releases spores.
     

  • A closer look can reveal differences that can distinguish between the main groups.

  •  'Mosses' tend to have a series of small spirally arranged leaves, which are usually a little pointy (left).

  • 'Hornworts' have a larger leaf at the base and their common name comes from their double pointed horn-like sporophyte.

  • The 'liverworts' are either 'leafy' or 'thallose'.

  • The first tend to look similar to moss with a series of small leaves, but they are arranged in one plane, and roughly opposite each other (in the left hand corner of the picture).

  • The 'thallose liverworts' tend to have single larger leaves at the base like Hornworts, but have a cup-shaped capsule at the end of their sporophyte.

    Script: Courtesy of  Damon Ramsey BSc.(Zool) Biologist Guide
     

Additional Moss Photo


Chambers Wildlife Rainforest Lodges
Lake Eacham, Atherton Tablelands
Tropical North Queensland, Australia.
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