EXPLANATION OF TERMS. 
fermentation of food in intestinal canal 
caused by Micrococcus Bombycis, Cohn. 
Flagellum. (a) Solitary long swinging 
process of the protoplasmof a swarmspore. 
(4) Long whip-like process on the cells of 
some Schizomycetes. 
Floccose mycelium. Same asfilamentous 
mycelium. 
Foliaceous thallus (thallus foliaceus). 
In Lichens: a flat, leaf-like, usually lobed 
and crisped thallus which spreads over 
the surface of the substratum, but is only 
attached at one or several scattered 
oints andcan be separated thereforefrom 
it without much injury. Same as frondose 
thallus (thallus frondosus), thallus 
placodes. 
Form-genus. A genus constituted by 
similar form-species. 
Form-species. Species constituted by a 
single stage of the life-cycle of a pleo- 
morphous species and supposed of itself to 
be the complete representative of a 
species. 
Formae oxydatae. In Lichens: crusta- 
ceous forms which have acquired a rust- 
colour owing to infiltration of a salt of iron. 
Frill. Same as armilla. 
Frondose thallus (thallus frondosus). 
Same as foliaceous thallus. 
Fructification. Unicellular or pluricellular 
body developed as a result of the sexual 
act from an archicarp alone or from 
adjacent hyphae as well. In the uni- 
cellular form it is a zygospore or oo- 
spore ; in the pluricellular form a sporo- 
carp. 
Fruticose thallus (thallus fruticulosus). 
In Lichens: a thallus attached by one 
point only and by a narrow base to 
the substratum from which it grows 
upwards as a simple or more usually 
branched shrub-like body. Same as fila- 
mentous thallus, thallus thamnodes. 
Fuliginosus. Sooty. 
Funiculus.. In Nidularieae: cord of 
hyphae attaching peridiolum to the inner 
surface of the wall of the peridium. 
Gamete. Sexual protoplasmic body, naked 
or invested with a membrane, motile 
(zoogamete or planogamete) or non- 
motile, which on conjugation with another 
gamete of like or unlike outward form 
gives rise to a body termed zygote. Same 
as conjugation-cell. 
Gattine. Same as pébrine. 
Gelatinous felt (Gallertfilz). 
gelatinous tissue. 
Gelatinous tissue (Gallertgewebe). Tis- 
sue which is slimy owing to the cell 
membranes being soft and mucila- 
ginous. Same as gelatinous felt. 
Same as 

495 
Gemma. Same as brood-gemma. 
Germ-cell. First product of commencing 
germination of a spore. 
Germ-tube (Keimschlauch). Tubular 
process put out by a spore in tube-ger- 
mination at one or more points of its 
surface which by continued progressive 
apical growth developes into a hypha 
forming either a promycelium or a 
mycelium. 
Germ-pore. Pit on the surface of a spore- 
membrane through which a germ-tube 
makes exit. 
Gill. Same as lamella. 
Gleba. Chambered sporogenous tissue 
within a sporophore. 
Glycogen-mass. Protoplasm permeated 
with glycogen, especially in asci. Same 
as epiplasm. Sometimes shortly termed: 
glycogen. 
Gonidiallayer. (a) Aggregation of simple 
gonidiophores to form a cushion-like 
layer or crust. (4) In heteromerous 
Lichens : same as algal layer. 
Gonidiophore Sporophore bearing a 
gonidium. Same as conidiophore. See 
sporophore. 
Gonidium. (a) Same as brood-cell. (4) In 
Lichens: algal cell of thallus. Same as 
chromidium. 
Gonimic layer. Same as algal layer. 
Gonoplasm. In Peronosporeae: portion 
of protoplasm of antheridium which 
passes through the fertilisation-tube and 
coalesces with the oosphere. Comp. 
periplasm. 
Green-rot. Disease in wood characterised 
by the tissues becoming a verdigris green. 
Peziza aeruginosa, Pers., is commonly 
associated with this condition, but its 
connection with the prominent feature 
of the disease is still uncertain. 
Growth-form. A vegetative structure 
marked by some easily recognised fea- 
ture of growth characterising individuals 
or stages in the life-cycles of types which 
have no necessary genetic affinity. Thus 
Sprouting Fungus, Filamentous Fungus, 
&c. are growth-forms. 
Gymnocarpous. Having the hymenium 
exposed when the spores are maturing. 
Comp. angiocarpous. 
Gynandrosporous. In Oedogonieae : dioe- 
cious forms in which the female plant 
produces androspores are gynandro- 
sporous. 
Haustorium. Special branch of a fila- 
mentous mycelium serving as an organ 
of attachment and suction. 
Heliotropism. Phenomena induced in a 
growing organ by the influence of illumi- 
nation. 
