~ 1899] CURRENT LITERATURE 413 
IN Journal de Botanigue 13:127, M. Ph. Van Tieghem proposes to dis- 
timinate the non-sexual reproductive bodies now called spores into three 
alegories. (1) The term sfores he retains for those bodies which are formed 
tyan adult plant and develop into a new “adult” individual. All the fungi 
and most of the algze form spores ; the gemmz or brood-buds of bryophytes 
‘Me Spores; but no vascular plants produce spores. (2) The term diodes 
(from dlob0s, passage — transition) is suggested for reproductive bodies, aris- 
iig0n the adult, which develop into a ‘‘ rudimentary ” body, the prothallium 
this establishing a transition between the “adult” and “rudimentary ” 
stages. Thallophytes and bryophytes have no diodes; they are peculiar to 
ascular plants. The diodes may be all alike (isodiody), or differentiated 
microdiodes and macrodiodes (heterodiody). (3) All the bryophytes, 
ihe Rhodophyceze and Mucoracezxe produce and set free viable cells which 
a not spores, because they do not arise from the adult stage, and not diodes, 
Fecause they produce directly an adult individual. To them is given the 
tame fomies, from Tour, to cut, because by them the total development from 
he egg is “cut” into two unequal parts, the smaller preceding the tomies, 
te larger following their growth. The rudimentary structure in which they 
“*tlormed is the tomiogone. 
_ The application of these new terms is obvious enough, but to the writer 
they seem Worse than useless because they obscure homologies — which is 
‘ko obvious enough.— C. R. B. 
