ArPENDIX. 
CKUOEIA ADH^EENS. 
Colour. 'Purplish, or discolouring olive. 
Suhstance. Tough, but rather fleshy-feeling. 
Character of Frond. A scab-like incrustation spreading on rocks and laminaria stems ; com- 
posed of minute densely-packed, upright-jointed threads {filaments)^ set in gelatine. 
Filaments tapering to both ends ; many of them quite simple ; a few once or twice 
forked upwards. 
Measurement. The patches indefinite. 
Fructification. Only one kind thoroughly ascertained ; though a second sort, (?) of unusual 
character, has been found. 1. Oblong Tetraspores (divided across into four), borne 
on the threads of which the frond is composed ; supplying the place of a branch in 
one of the lower forkings. 2. (?) A large pear-shaped, green., spore-like body, 
enclosed in a large transparent gelatinous case {capsule), terminating some of the 
threads. 
Habitat. Kilruggan, opposite Gourock: Professor Walker Arnott. Aberdeen: Dr. Dickie. 
Penzance: Mr. Ealfs. Kilkee, 1844, Cushendall, Co. Antrim, 1850: Dr. Harvey. 
And probably in many other places. On rocks between tide-marks. 
From the account of this plant, sent by Dr. Harvey to the Natural History Review, it 
would seem that if not two species, two forms of Cruoria adhwrens O were furnished by 
Dr. Arnott, from the same locality. The one with tetraspores, the other with the green 
spore-like bodies mentioned above. Whether to consider this latter variety, which differed 
little from the other, except in the smaller diameter and shorter joints of its threads, a 
new species, under the name of C. Arnottii, or to regard its singular fruit as the true spores 
of a Cruoria, Dr. Harvey doubted; nor can anything further he said in the matter than to 
call the attention of collectors to the fact of hw much remains to be discovered about these 
odd incrustations. They form red stains on rocks and stones, as if blood had been spilt 
there, and can only he removed by a knife ; and, of course, can only he understood by exami- 
nation under the microscope. 
ACTINOCOCCUS HENNEDYI. 
Colour. Deep red. 
Substance. • Toughish, but beautifully gelatinous. 
Character of Frond. Like a drop of blood ; indefinite in outline ; composed of minute closely- 
packed, upright-jointed bead-like threads {filaments), set in gelatine. Filaments 
tapering upwards ; bead-like ; sometimes simple, but frequently once or twice 
branched. 
Measurement. A homoeopathic globule ! but sometimes several together. 
Fructification. Only one kind known. Large tetraspores, formed by degrees in nearly all the 
joints of the threads, transforming them into “ necklace-like strings of deep red 
beads.” Each tetraspore divided cross-wise {cruciate). 
Habitat. On an old root of Laminaria digitata at Cumbr^e : Mr. Eoger Hennedy, 1852, On 
a rock, near high-water mark : Professor Walker Arnott. 
A beautiful microscopic object. For a scientific account and figure of this plant and 
others, see Natural History Review for 1857, “ Proceedings of Societies,” p. 201. 
Loudon : — Stranoewats and Warden, Printers, 28 Castle St, Leicester Sq. 
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