456 



INTSODUCTION TO CEYPTOGAMIC BOTANY. 



tella is not an uncommon English species, and is, indeed, 

 almost cosmopolitan ; but it is far surpassed by T. lanata 

 (Fig. 96, e), which looks like a tangled worsted thread. 



Fig. 96. 



a. Leaves and stipule of Mastigobryum cordistipulum. ] 



b. Leaf of Lepidozia lavifolia. 



c. Ditto of Micropterygium, nutans. 



d. Tissue of Sendtnera diclados. 



e. Stipule of Trichocolea lanata. 



All more or less magnified. From specimens in the Hookerian 

 Herbarium . 



11. CCELOCAULES, Necs. 



Fruit inserted in a hollow of the stalk ; leaves incubous, 

 folded, bifid, crested. 



501. This tribe includes some of the finer species, which are 

 known by their large size and apparently double row of suc- 

 cubous leaves. Almost all belong to warm or equable climates, 

 and are found both on the ground and on the trunks of trees, 

 principally in the southern hemisphere. There is no perianth, 

 the functions of which are performed by the hollow in the 

 stem, in which the sporangia are sunk. This arises from the 

 outer wall of the stem being carried up when the archegonium 

 is impregnated. The calyptra bears on its surface the unim- 

 pregnated archegonia, as we have seen in Symphyogyna, 



