EXPLANATION OF TERMS. 
Abjection (Abschleuderung) of spores. 
Throwing off with force of spores from 
a sporophore. 
Abjoint. To joint off or delimit by septa. 
Abjunction (Abgliederung). Delimitation 
by septa of portions of a growing hypha 
as spores. 
Abscise. To cut off or detach by solu- 
tion of a zone of connection. 
Abscision (Abschnürung) of spores. 
Detachment of spores from a sporo- 
phore by disappearance through dis- 
organisation or otherwise of a connecting 
zone. 
Accessory gonidia. In Mucorini: goni- 
dial formations found in some species in 
addition to the typical ones of the group. 
Actinomycosis. A disease in animals and 
man characterised by the development 
of tumours in the jaw-bone, vertebrae, 
lymphatic glands and other places within 
which sulphur-yellow bodies like sand- 
grains occur, each consisting of an aggre- 
gate ofan organism, Actinomyces, which 
is supposed to be a Fungus. 
Acrogenous. (a) Producing atthe summit. 
(6) Produced at the summit. 
Acrogonidium. Gonidium formed at the 
summit of a gonidiophore. 
Acropetal. In the direction of the summit. 
Comp. basipetal. 
Acroscopic. Looking towards the summit, 
i.e. on the side towards the. summit. 
Comp. basiscopic. 
Acrospore. Spore formed at the summit 
of a sporophore. 
Adventitious. Produced out of normal 
and regular order. 
Aecidiospore. Spore formed in an ae- 
cidium. 
Aecidium. In Uredineae: sporocarp 
consisting of a cup-shaped envelope 
(peridium) and a hymenium occupying 
the bottom of the cup from the basidia 
of which spores (aecidiospores) are 
serially and successively abjointed. 

Aerobiotic. Organisms which require 
for their vegetation a supply of free 
oxygen are aeriobiotic. Comp. anaero- 
biotic. 
Aethalium. In Myxomycetes: com- 
pound sporiferous body formed from a 
large combination of plasmodia. 
Algal layer. In heteromerous Lichens: 
green band at the line of junction of the 
rind and medulla of the thallus in which 
the cells of the Alga of the Lichen are 
aggregated. Same as algal zone, goni- 
dial layer, gonimic layer, stratum 
gonimon. 
Algal zone. Same asalgal layer. 
Alveolate. Pitted so as to resemble honey- 
comb. 
Amoeboid. Like an amoeba, i.e. a small 
portion of protoplasm exhibiting creeping 
movement by putting out and drawing in 
pseudopodia. 
Amylogenesis. Formation of starch. 
Amylum-grain. Starch grain. 
Analogous. Having the same function. 
Comp. homologous. 
Androgynous. Having male and female 
sexual organs developed on the same 
branch of the thallus. Comp. diclinous. 
Androspore. Male spore, i. e. spore which 
on germination produces a body bearing 
a male sexual organ. 
Anaerobiotic. Organisms which can 
vegetate without a supply of free oxygen 
are anaerobiotic. Comp. aerobiotic. 
Angiocarpous. Having a hymenium 
developed by internal differentiation 
within the sporophore and from the 
first covered by a special envelope. 
Comp. gymnocarpous. 
Annulus. In Hymenomycetes : portion of 
ruptured marginal veil or of tissue of the 
stipeforming a collar orfrill or sheath upon 
the stipe after the expansion of the pileus. 
Frequently used to designate the special 
form distinguished as annulus inferus. 
Same as ring. 
