FUNGOID PESTS OF CULTIVATED PLANTS. 197 



The former are ellipsoidal (38-50 x 23-26 /a), divided transversely into two 

 cells, and of an orange-brown colour. The stems or pedicels are very long 

 and colourless. 



Each cell is capable of germination, as in Puccinia, and produces a 

 filament, called a promycelium, the extremity at length divided off into 

 three or four cells, each of which develops a secondary spore. 



Journ, Q.M.S. 1871, t. xix. tig. 2 ; Sacc. Syll. vii. 2608 ; Plowr. Brit. 

 Urecl. p. 230 ; Journ. B.H.S. 1902, xxvi. p. 724, fig. 303 ; Cooke, Hdbk. 

 No. 1517 ; Berk. Outl. t. 2, f. 4 ; Hart. £ Som. in Dis. Trees, p. 158. 



Confounded Savin Jelly-rust. 

 Gymnosporangium confusum (Plowr.), PI. XVIII. fig. 42. 



This is another gelatinous rust which affects the twigs of the Savin, 

 which is said to resemble so closely the other species that it cannot be 

 distinguished from it ; hence we are at a loss to discover how its sponsors 

 are to recognise it. The difference is said to exist in its life-history ; 

 that its first stage, or cluster-cups, are found upon the Medlar, Quince, and 

 Hawthorn. No one can tell how to distinguish the teleutospores on the 

 Savin from the teleutospores of the other and original species. It is a 

 pretty fairy tale, and should be kept in the nursery. 



Teleutospores smooth, oval or elliptical, generally acute at both ends, 

 of two kinds, the more numerous with hyaline spore-walls and orange- 

 yellow contents, the other with dark brown thick walls (40-50 x 20-25 /x) 

 with from two to four germ tubes, pedicels long (80-100 n), hyaline. 



Ploivr. Brit. Urecl, p. 232, t. iv. figs. 13, 14 ; Mass. PL Dis. p. 287. 



Gymnosporangium trcmelloides has its teleutospores on Juniperus 

 communis, and its aecidium form on Pyrus Aria in the Bavarian Alps. 

 Hart. & Som. in Dis. Trees, p. 159. 



Savin Leaf-dot. 

 Coryneum Berkeleyi (Cooke), PL XVIII. fig. 43. 



In the English Flora, Berkeley described a parasite on the leaves 

 of Juniperus Sabina, which he called Poclisoma foliicola. In 1871 we 

 demonstrated that this was not a Poclisoma at all, having examined his 

 specimens, so that we applied the name of Sarcostroma Berkeleyi. Since 

 that time we have doubted whether it had not better be referred to 

 Coryneum. In'no form is it recognised in Saccardo's " Sylloge." 



It makes its appearance in spring, on living leaves, as small 

 subelliptic black excrescences, not larger than the head of a pin. 

 Internally it consists of a tremelloid stroma, from which radiate long 

 hyaline peduncles, surmounted each by an elliptical or subfusiform spore 

 or conidium, of a dull brown colour when mature, and divided by three, 

 or rarely five, transverse septa (30x8/j). 



This parasite does not appear to have been observed anywhere else, 

 and only on rare occasions in this country, so that it has not really 

 developed into a pest. 



Journ. Q.M.S. 1871, pi. xix. fig. 4 ; Cooke, Hclbk. No. 1518. 



