144 Johnson— Observations on Phaeozoosporeae. 
4. In Desmarestia ligulata , unilocular sporangia, containing 
one to four spores, and morphologically equivalent to any cell 
of the thallus, occur. In mode of growth of thallus, and in 
contents of sporangia, Desmarestia shows a close relationship 
to the Tilopterideae. 
EXPLANATION OF FIGURES IN PLATE VIII. 
Illustrating Mr. T. Johnson’s paper on Phaeozoosporeae. 
Carpomitra Cabrerae Kiitz. 
Fig. 1. A small portion of thallus showing tufted apices of branches, slightly 
magnified. 
Fig. 2. Longitudinal section of apex of branch showing nature of trichothallic 
growth. 3 m, Merismatic region of tuft, x 80. 
Fig. 3. Fertile tip of thallus, slightly magnified, r, Receptacle ; t, remains of 
apical tuft of hairs. 
Fig. 4. Surface of receptacle, x 400. p , A branching paraphysis ; s, s', s", 
stages in the sporangia ; a, cells of surface proper of receptacle. 
Sporochmts pedunculatus Ag. 
Fig. 5. Thallus showing stalked receptacles, r\ apical tufts of hairs, t; r, a 
branching receptacle, slightly magnified. 
Fig. 6. A maturing receptacle more highly magnified. 
Fig. 7. Surface of receptacle. Letters as before, x 400. 
Fig. 8. Zoospore, x 900. 
Arthrocladia villosa, (Huds.) Duby. 
Fig. 9. Fertile filament, sc, Sterile cells, x 900. 
Fig. 10. Intercalary sporangia, x 320. 
Fig. 11. A zoospore, x 900. 
Desmarestia ligulata, (Lightf.) Lamour. 
Fig. 12. Apex of a cortexed branch, pa, Primary septate axis; is, intercalary 
sporangia ; h, branching hairs, only a few represented ; m, merismatic region. 
X 120. 
Fig. 13. Cortical sporangia cs; is, intercalary sporangia on hair-pinnule,, 
X 240. 
Fig. 14. Intercalary sporangia is, on branchlet of primary axis, several spores 
in each, x 240. 
