elliptic ovate. The cells are rounded and very full of chlorophyll. The 

 lower lobe is round-o'vate, hardly half as wide as the stem. The antheridial 

 spike is long-linear, obtuse, and is borne on the side of the stem-below the 

 fold of the leaf. The species occurs on rotten trunks, and is not often 

 found. 



Radula australis Austin. 



This is a small species occurring in the South (Georgia and Florida). 

 The plants are prostrate, sparingly branched and loosely ca^spitose. The 

 leaves are somewhat decurrent, and the lower lobe is adnate to the stem 

 along its inner margin. The perianth is long, compressed, and cylindric 

 with an obconic or pear-shaped base. The mouth ^is bilabiate and emar- 

 ginate or crenate. The antheridial spikes are short and broad, and are found 

 on the branches. 

 Radula Caloosiensis Aust. 



This species was found by Austin himself near Caloosa, Florida, and ac- 

 cordingly has received its specific name from this place. The stems are 

 short and sparingly branching. The leaves are entire or sometimes 

 obscurely crenate, the margins very often bearing gemmse. The lower lobe 

 is large and either acuminate or obtuse, and has its inner margin adnate to 

 the stem. The perianth is short, broadly oblong-quadrate from an obconic 

 base; and is strongl}^ compressed. It is bilabiate, with the lips entire, their 

 margin decurved. Antheridial spikes are long and loose. 

 Radula Hallii Aust. 



This species was very briefly described by Austin from material col- 

 lected by Hall at Salem, Oregon, and named for the collector. In many 

 ways, such as size, perianth and general appearance, it is much like R. 

 complanata, but has its perianth larger, elliptic-oblong, instead of obconic, 

 and narrowed at the apex. The mouth of the perianth is sometimes fleshy. 

 Radula Xalapensis Mont. 



This is another species v^hich occurs in the South, collections having been 

 made on wet rocks at Tallulah Falls, in Georgia, by Sullivant and Lesquer- 

 eux, and at Toccoa Falls, Georgia, by Underwood. The stems are closely 

 pinnately branched, and somewhat flaccid. Leaves are orbicular, obtuse, 

 and closely imbricated. The lower lobe is broad, nearly round, and has an 

 undulate margin. The base is somewhat adnate to the stem. The perianth 

 occurs either on terminal or lateral branches, and is long funnel-form with 

 mouth compressed and slightly crenate. 

 Radula Sullivantii Aust. 



Again a Southern species, having been collected in Georgia by Sullivant, 

 Lesquereux, and Underwood. 



The stems are closely csespitose, with short, spreading branches. 

 Leaves loosely imbricate, round-oval, more or less decurved at the apex, 

 with subrepand-dentate margin. The lower lobe is somewhat inflated at the 

 apex, usually obtusely triangular, with the inner margin adnate to the stem, 

 and parallel to it. 



