EXPLANATION OF TERMS. 
cations in this book :—(a) Leveillé’s term 
for sporophore. (4) Same as stroma. 
(c) In Ascomycetes : stalk of a discocarp. 
(a) In Ascomycetes: same as pyenidium. 
e) In Phalloideae: inner portion of 
sporophore supporting the gleba. (/) In 
Lichens: cup of the thallus containing 
soredia. 
Rejuvenescence. Transformation of whole 
of protoplasm of a previously existing cell 
into a cell of a different character. 
Resin-flux (Harzsticke, Harzüberfülle). 
Disease in conifer characterised by 
copious flow of resin with ultimate death 
of the tree, due to attack of Agaricus 
melleus. 
Resting period. Period during which a 
dormant or quiescent state is exhibited. 
Same as involution-period. 
Resting-stage. Stage of dormancy or 
quiescence. Same as involution-stage. 
Resting state. Quiescent or dormant 
condition. 
Rheotropism. Phenomena induced in a 
growing organ by the influence of a cur- 
rent of water. 
Rhizine. Same as rhizoid. 
Rhizoid. Delicate filiform or hair-like 
organ of attachment. Same as rhizine. 
Rhizomorphous. Having delicate branch- 
ing form like rootlets. 
Rind. (a) The outer layer or layers of a 
Fungus-body. Same as cortex. In 
Lichens: same as stratum corticale. 
(5) The outer layers of the bark in a 
tree with secondary thickening and some- 
times all the tissue outside the active 
phloem. 
Ring. Same as annulus. 
Ringworm. Disease of the skin due to 
Trichophyton tonsurans, Malmsten. 
Same as tinea tonsurans, herpes ton- 
surans. 
Rudimentary (rudimentär). An organ 
or member is rudimentary which remains 
stationary at a stage of development in 
which it is in every respect immature. 
Saprophyte. Plant living on dead organic 
substance. Comp. parasite. 
Schizogenetic. Formed by separation of 
tissue elements owing to splitting of the 
common wall of cells. 
Sclerosed. Exhibiting sclerosis. 
Sclerosis. Induration of a tissue or a cell- 
wall either by thickening of the mem- 
branes or by their lignification, i.e. for- 
mation of lignin in them. 
Sclerotioid. Resembling a sclerotium. 
Sclerotium. Pluricellular tuber-like reser- 
voir of reserve material forming on a 
primary filamentous mycelium from which 
it becomes detached when its develop- 

499 
ment is complete, usually remains dormant 
for a time, and ultimately produces shoots 
which develope into sporophores at the 
expense of the reserve material. In 
Mycetozoa the sclerotium is formed out of 
a plasmodium and after its period of 
rest developes a plasmodium again. 
Secondary mycelium. Rhizoid attach- 
ments developed from the base of a 
sporophore which are somewhat like the 
normal mycelium of the species. 
Semen multiplex. Tulasne’s term for 
sporidesm. 
Septate spore. Same as sporidesm. 
Simple sporophore (Fruchthyphe, 
Fruchtfaden). Sporophore consisting 
of a single hypha or branch ofa hypha 
Same as filamentous sporophore 
Comp. compound sporophore. 
Soredial branch. Branch produced by 
the development of a soredium into a new 
thallus while still on the mother-thallus. 
Soredium. In Lichens: single algal cell or 
group of algal cells wrapt in hyphal tissue, 
which, when set free from the thallus, is 
able at once to grow into a new thallus. 
Same as brood-bud. 
Soredium-heap. Same as sorus. 
Sorus. Heap or aggregation. (ae) In 
Synchitrieae: heap of sporangia devel- 
oped from a swarmcell. (6) In Lichens : 
heap of soredia forming a powdery mass 
on the surface of thallus. 
Spermatiophore. Structure bearing a sper- 
matium. 
Spermatium. Male non-motile gamete- 
cell which conjugates with a trichogyne. 
The male sexual function of all spermatia 
is not yet demonstrated. 
Spermatozoid. Male motile gamete. 
Spermogonium. Receptacle in which 
spermatia are abjointed. 
Spora cellulosa. Same as sporidesm. 
Spora composita. Same as sporidesm. 
Spora multilocularis. Same as spori- 
desm. 
Sporangiolum. In Mucorini: small 
sporangium produced in some genera in 
addition to the large sporangium. 
Sporangiophore, Sporophore bearing a 
sporangium. See sporophore. 
Sporangium. Sac producing spores endo- 
genously. 
Spore. Single cell which becomes free and 
is capable of developing directly into a 
new bion. 
Spore-group. Same as sporidesm. 
Spore-plasm. Protoplasm of a sporangium 
devoted to the formation of spores. 
Sporidesm. Pluricellular body becoming 
free like a spore and in which each cell is 
an independent spore with power of ger- 
mination. Same as spore group, com- 
Kok 2 
