Trichogyne, prolongation of the egg-cell in Florideae which acts as a receptive tube; septate hypha in lichens arising from the ascogonium, [160], [177-181], [273].
Woronin’s hypha, a coiled hypha occurring in the centre of the fruit primordium, [159], [163].
ERRATA
| [p. 24.] | For Baranetsky read Baranetzky. |
| [p. 277.] | For Ascolium read Acolium. |
| [p. 318.] | For Lepolichen coccophora read coccophorus. |
Transcriber’s Note: The errata have been corrected.
INTRODUCTION
Lichens are, with few exceptions, perennial aerial plants of somewhat lowly organization. In the form of spreading encrustations, horizontal leafy expansions, of upright strap-shaped fronds or of pendulous filaments, they take possession of the tree-trunks, palings, walls, rocks or even soil that afford them a suitable and stable foothold. The vegetative body, or thallus, which may be extremely long-lived, is of varying colour, white, yellow, brown, grey or black. The great majority of lichens are Ascolichens and reproduction is by ascospores produced in open or closed fruits (apothecia or perithecia) which often differ in colour from the thallus. There are a few Hymenolichens which form basidiospores. Vegetative reproduction by soredia is frequent.