494 



EXPLANATION OF TERUfS. 



Discocarp. In Ascomycetes : ascocarp in 

 which the hymenium lies exposed whilst 

 the asci are maturing. Same as apothe- 

 cium, cup. 



Discus. Hymenium of a discocarp. Same 

 as lamina proligera, lamina sporigera. 



Dissepiment. Same as trama. 



Dorsiventral. Horizontally extended so as 

 to have a dorsal and a ventral surface. 



Ectosporous. Having exogenously formed 



spores. See exosporous. Comp. endo- 



sporous. 

 Ejaculation of spores. Same as ejection 



of spores. 

 Ejection (Ausschleuderung) of spores. 



Throwing out with force of endogenously 



formed spores from a sporangium. Same 



as ejaculation of spores. 

 Elater. InMyxomycetes: a free capillitium 



thread. 

 Encarpium. Trattinick's term for sporo- 



phore. 

 Endogenous. Produced inside another 



body. Comp. exogenous. 

 Endogonidium. Gonidium formed within 



a receptacle (gonidangium). 

 Endophyte. Plant growing inside another 



plant and parasitic upon it or not parasitic. 



Comp. epiphyte. 

 Endosporium. Innermost coat of a spore. 



Comp. exosporium, episporium. 

 Endosporous. Having endogenously 



formed spores. Comp. exosporous, 



ectosporous. 



Entozoic. Living inside an animal. 

 Envelope-apparatus. In Ascomycetes : 



all the parts of the sporocarp except the 



ascus-apparatus which consists of asci 



and the ascogenous cells. 

 Epinasty. That state of a growing dorsi- 



ventral organ in which the dorsal surface 



grows more actively than the ventral 



surface. Comp. hyponasty. 

 Epiphloeodic. Of Lichens : living upon 



the surface of the periderm of a plant. 



Comp. hypophloeodic. 

 Epiphragm. In Nidularieae : delicate 



membrane closing the cup-like sporo- 



phore. 

 Epiphyte. Plant growing upon the outside 



of another plant and either not parasitic 



upon it or parasitic. Comp. endo- 



phyte. 



Epiplasm. Same as glycogen-mass. 

 Episporium. Outer (second) coat of spore. 



See exosporium. Comp. endosporium. 

 Ergotised. Attacked by ergot. 

 Excipulum. Outer envelope of a disco- 

 carp developed as part of the envelope- 

 apparatus. 

 Exogenous. Produced on the outside of 



another body. Comp. endogenous. 



Exosporium. (a} Same as episporium. 

 (b) In Peronosporeae : thick coat de- 

 veloped from periplasm around the oo- 

 spore. 



Exosporous. Having exogenously formed 

 spores. Comp. endosporous. 



Extracellular. Outside of a cell. Comp. 

 intracellular. 



Extramatrical. Outside of a matrix or 

 nidus. Comp. intramatrical. 



Facultative. Occasional, incidental. Comp. 

 obligate. 



Facultative parasite. An organism which 

 can and normally does go through the 

 whole course of its development as a 

 saprophyte, but which may also go 

 through its development wholly or in 

 part as a parasite. Comp. obligate 

 parasite, facultative saprophyte. 



Facultative saprophyte. An organism 

 which normally goes through the whole 

 course of its development as a parasite, 

 but which can at certain stages vegetate 

 as a saprophyte. Comp. obligate para- 

 site, facultative parasite. 



Favus. Disease of the skin caused by 

 Achorion Schonleinii, Remak. 



Felted tissue. Same as tela contexta. 



Fertilisation-tube. In Peronosporeae : 

 tube put out by the antheridium which 

 pierces the oogonium and is the channel 

 through which gonoplasm passes from the 

 antheridium to the oosphere. 



Fibrillose. Having a finely lined appear- 

 ance as if composed of fine fibres. 



Fibrillose mycelium. Same as fibrous 

 mycelium. 



Fibrous mycelium. Mycelium in which 

 the hyphae form by their union elongated 

 branching strands (mycelial strands). 

 Same as fibrillose mycelium. Comp. 

 filamentous mycelium, membranous 

 mycelium. 



Filamentous Fungus (Fadenpilz). 

 Growth-form in which the thallus is con- 

 stituted by a branched hypha alone, i.e. 

 without union with other hyphae. Comp. 

 Compound Fungus-body, Sprouting 

 Fungus. 



Filamentous mycelium. Mycelium of 

 free hyphae which are at most loosely 

 interwoven with one another, but without 

 forming bodies of definite shape and out- 

 line. Same as floccose mycelium. 

 Comp. fibrous mycelium, membran- 

 ous mycelium. 



Filamentous sporophore. Same as sim- 

 ple sporophore. 



Filamentous thallus (thallus filamen- 

 tosus). Same as fruticose thallus. 



Flabelliform. Spread out like a fan. 



Flacherie. Disease of the silkworm due to 



