EXPLANATION OF TERMS. 



495 



fermentation of food in intestinal canal 

 caused by Micrococcus Bombycis, Cohn. 



Flagellum. (a) Solitary long swinging 

 process of the protoplasmof a swarmspore. 

 (b) Long whip-like process on the cells of 

 some Schizomycetes. 



Floccose mycelium. Same as filamentous 

 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 

 points andean be separated therefore from 

 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 pebrine. 



Gelatinous felt (Gallertfilz). Same as 

 gelatinous tissue. 



Gelatinous tissue (Gallertgewebe). Tis- 

 sue which is slimy owing to the cell 

 membranes being soft and mucila- 

 ginous. Same as gelatinous felt. 



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. 



Gonidial layer, (a) Aggregation of simple 

 gonidiophores to form a cushion-like 

 layer or crust, (b) In heteromerous 

 Lichens : same as algal layer. 



Gonidiophore. Sporophore bearing a 

 gonidium. Same as conidiophore. See 

 sporophore. 



Gonidium. (a) Same as brood-cell, (b) 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 hymeniu'm 

 exposed when the spores are maturing. 

 Comp. angiocarpous. 



Gynandrosporous. InOedogonieae : 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. 



