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DescriptionTolypella nidifica is a delicate species of stonewort with many branches and grows up to 20 cm tall. Stoneworts are so-called as they are submerged algae that are usually encrusted with calcium. It has long and slender sterile branches and short fertile branches that are incurved to form tufted heads resembling bird's nests. It is dark brownish-green in colour and can be recognised, over similar species, by the blunt tips to its branchlets.The sexual structures of Tolypella nidifica are over 0.5 mm in diameter, much larger than the clustered stonewort Tolypella glomerata, and unlike the latter species, the spore is reddish in colour (Bryant & Stewart, 2002).