dichotomous. The apices are strongly inrolled. No fructification has yet 
been observed on Australian specimens. ‘The colour is a deep purple, be- 
coming paler on exposure. The substance is cartilaginous, not very soft. 
In drying, the frond adheres, but not closely, to paper. 
This species belongs to a different section of the genus from 
that to which the two species already illustrated (Plate CLXXVI.) 
belong. In B. Harveyi the axile cells are in several rows sur- 
rounding a central celi; in B. mixta and rivelaris they are in a 
single row. By this character, therefore, as well as the minute 
size of the surface-cellules, our plant is readily known from its 
Australian congeners; but it comes very near the European B. 
scorpiotdes, from which its smaller size and more slender branches 
and ramuli chiefly distinguish it. 
Fig. 1. Bostrycuta Harveyi,—the natural size. 2. Part ofabranch. 3. A 
ramulus. 4. Transverse section of stem :—magnified. 
