The Genus Riccardia in Chile. i45 



three secondary branches, 0.5-1.5 mm. long and 0.1-1.5 mm. wide, 

 and these are usually tapering. In case the main axis itself tapers 

 there is a tendency for the primary branches to become shorter 

 and less subdivided as the apex is approached, some in fact remain- 

 ing perfectly simple. In their histological features the branches 

 resemble the main axis. The secondary branches (Fig. 4, C) and 

 the apical portions of the primary branches are usually only four 

 cells thick in the median portion, and the cells of the surface-layer 

 are relatively larger than in the axis. In some cases the marginal 

 row or double row is especially distinct, and it would not be stretch- 

 ing a point to sa}- that a narrow wing was present. 



Only a few male branches, all of which sprang directly from the 

 main axis, have been observed by the writer. An inflorescence 

 occupies nearly the whole of a branch and is usually 0.4-0.9 mm. 

 in length by 0.3-0.35 mm. in width. It bears a spreading crenulate 

 wing, usually only one or two cells wide, and from six to twelve 

 antheridia, the openings into the antheridial chambers being usually 

 separated by two rows of cells. The female inflorescences are 

 borne on very short and broad primary branches and never 

 proliferate. They are bounded by a wing two to four cells wide 

 and crenulate along the margin from projecting cells ; in rare cases 

 blunt teeth one or two cells long are present. Between the wings 

 and the archegonia a narrow crenulate ridge can be distinguished, 

 constituting with the wings the involucre of the inflorescence. 

 Only two to four archegonia are produced by each inflorescence. 

 According to Stephani the "calyptra" is cylindrical, thick, smooth, 

 rounded at the apex and destitute of a corona. These statements 

 are fully confirmed by the very immature ''calyptras" in the 

 specimens examined, except that a low corona can be dis- 

 tinguished. 



10. Riccardia chilensis (Steph.) comb. nov. 



Ancura chilensis Steph. Kungl. Svenska V^et.-Akad. Handl. 49®: 

 6. /. I, b. 1911. 



Specimens examined: in woods, Huafo Island, southern Chile, 

 1908, Skotfsberg 68 (U., t}^pe of Anenra chilensis). Known only 

 from the type locality. 



There are certain resemblances between R. corralensis and R. 



