GROUPS OF SPORE-FORMS 39 
little flattened on one side, while in Ochropsora they are 
spindle-shaped. This is one of the reasons for suspecting that 
it is probably incorrect to classify these two latter genera in 
the same family, on the basis of the “internal” basidium 
merely. The genus Chrysopsora, which has the same kind of 
basidium, belongs to the Pucciniacee. 
GROUPING ACCORDING TO SPORE-FORMS. 
For certain purposes it is convenient to have names for the 
groups into which the Uredinales may be divided according to 
the number of spore-forms possessed by each, though it must 
never be forgotten that such a grouping does not in any way 
indicate affinity. The method usually employed is that put 
forward by Schréter, which (with a little modification according 
to present ideas) may be presented in the following scheme. 
Denoting spermogones by O, ecidia by I, uredospores by 
II, and teleutospores (with the ensuing basidiospores) by III, 
we call a fungus possessing 
[ee if with all four on one 
lant. 
O TALTE |: Be eer, if O, I on one species, 
and II, III on another. 
OI III | an -opsis-form. 
O ILIII | a Brachy-form. 
JI III | a Hemi-form (in many cases perhaps the half of a 
Hetereu-form). 
[O] III | a Micro-form (spermogones sometimes absent). 
Thus Melampsora Rostrupii is a Eumelampsora, Gymno- 
sporangium Sabinae is a Gymnosporangiopsis, Uromyces Anthyl- 
lidis is a Hemiuromyces, and Puccinia Campanulae is a Micro- 
puccinia. A Leptoform is one, of whatever kind, in which the 
teleutospores germinate as soon as mature, without any resting 
period; thus the spores of P. Malvacearum belong chiefly to 
the lepto-form, those of Endophyllum Sempervivi entirely so. 
Maire (Progress. Rei Botan. 1911, iv, 115) has proposed a 
much more complex arrangement on the same lines, which is 
quite needless and, it is to be hoped, will be quietly ignored. 
