Text-book of structural and physiological botany . Fig. 414.—Cladonia digitata, aFruticose Lichen ; a apothecia ;h cup; c foliaceous thallus (natu-ral size). Fig. 415.—Ceiraria islaridica, a FruticoseLichen ; the margin of the thallus isfringed, and bears spermogonia on theedge of the fringe ; there are no apothecia. gonidia. This theory has been confirmed by the produc-tion of a perfect Lichen, Collema glaucescens^ by sowing its u 290 St7uct2tral and Physiological Botany. spores on the gODidia-forming Alga, Nostoc lichenoides. Anopposite view is entertained by others, that Lichens are adistin
Text-book of structural and physiological botany . Fig. 414.—Cladonia digitata, aFruticose Lichen ; a apothecia ;h cup; c foliaceous thallus (natu-ral size). Fig. 415.—Ceiraria islaridica, a FruticoseLichen ; the margin of the thallus isfringed, and bears spermogonia on theedge of the fringe ; there are no apothecia. gonidia. This theory has been confirmed by the produc-tion of a perfect Lichen, Collema glaucescens^ by sowing its u 290 St7uct2tral and Physiological Botany. spores on the gODidia-forming Alga, Nostoc lichenoides. Anopposite view is entertained by others, that Lichens are adistinct class of plants by themselves, the gonidia of whichsometimes become detached from the parent-plant, andthen carry on an algoid existence, in which state they haveoften been erroneously described as Algse. Lichens are classified as under, viz. :— I. Lichens with a stratified thallus :— Heteromerous Lichens. 1. Fruticose Lichens ; thallus more or less arborescent inform (Figs. 409, p. 285 ; 414, 415). 2. Foliaceous Lichens ; thallus leaf
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