OF SOUTH AUSTRALIA. 
341 
Attachment discoid. Stem for 2 cm. to 5 ,cm. above base clothed with 
short woolly hairs ; later glabrous. All the axils are acute and the divisions 
erecto-patent. Every part of the frond is elegantly pectinated with short, 
alternate, acute ramuli about 2 mm. long. The axile tube is slender, sur- 
rounded by a double, very thick cortical layer. The favellae terminate 
abbreviated lateral branchlets, and are surrounded by several serrated 
ramuli. The tetraspores are very small, and crowded in a dense sorus along 
the upper edge of the pinnules, near their points. Colour full dark-red 
Substance cartilaginous. Does not firmly adhere to paper. 
Southern Coast of Australia, Tasmania. 
PTILOTA C. Agardh. 
Fronds erect, compressed or two edged, pectino-pinnate, inarticulate, 
with an articulate axis usually corticate with many cells in strata; internal 
stratum of round cells, interspersed with narrow tubes, thin or thick; 
cortical of minute vertical cells. Apical cell transversely septate. Cysto- 
carps formed on terminal pinnules, often involuerated with conjoined or 
separate ramelli ; producing many hyaline, angular carpospores within the 
Fig. 168 . — Ptilota Hannafordi : a, plant; b, a pinna, 
with its opposing abortive pinnae; c, 
section through the stem; d, pinnule, 
bearing tetraspores. (After Harvey.) 
