ISTEW OK ISTOTEWORTHT FUNOI '*345 



being wholly gveenish-bi'own, but on this the tufts are very few and 

 evidently only beginning to be developed. On comparing the whole 

 sei'ies, it is impossible to come to any other conclusion than that they 

 form, stages of the growth of one and the same fungus, 



302. Verticillium globuliforme Bon. Abhandl. Geb. Mykol. 

 ii. 94. Sacc. Syll. iv. 152. 



Var. ELLiPSOiDEUM var. nov. Conidiis ellipsoideis, plerumque 

 4-5 X U-2 IX, V. usque 7-2\ jt.. (Tab. 550. f. 19.) 



On culms of Juncus, Sutton Park (Wk.). May. 



The tufts of hyphse are almost globular in shape, about \ mm. 

 broad, each seated separately in the centre of a little thin circular bed 

 of radiating white creeping flocci. The hyphse that form the tuft 

 are densely crowded, erect, frequently branched, irregularly below 

 but towards the summit becoming trichotomous, and having at the 

 end a verticil of three or four branchlets ; the branchlets subulate, 

 often incurved, about 20-25 ^ long. The hyphse are septate only at 

 the nodes or points where the branches are given off. Bonorden's 

 type of the species differed only in the globose conidia. 



303. Cercospora dubia Wint. Hedwig. 1883, p. 10. Sacc. Syll. 

 iv. 456. Hamularia diihia Riess, Hedwig. 1854, pi. 4, fig. 9. 



Spots roundish, 3-6 mm. diam., at first greenish-brown, then dry 

 and pallid. Hyjjhaj fasciculate in little distinct clusters, amj)hi- 

 genous, olivaceous, appearing simple, but irregular, septate only 

 below, paler upwards. Conidia terminal and lateral, subcylindrical or 

 somewhat fusoid, 3-septate, colourless, minutely guttulate, 36-55 x 

 5-6 //. (Tab. 550. f. 20.) 



On living leaves of Atn'plex 2)afula. Near the Severn, Worcester. 

 Sept. 



The dark tufts of hyphse are mostly collected in the centre of the 

 spots ; the hyphte are marked with a very distinct oval hilum or scar 

 at the points where the conidia were attached, and a similar scar is 

 equally obvious at the base of each fallen conidium. The hy])h3e are 

 not simple, but really bi'anched cymosely, somewhat after the style 

 of Phytoplithora infestans; an apical conidium is produced, and then 

 the hypha grows out laterally below it (but without a septum), 

 bearing another conidium at its apex, and the process is repeated. 

 Miss E. M. Wakefield has kindly examined C. duhia, Bab. -Wint. 

 Fung. Eur. no. 2780 (on Chenopodium), also Mycoth. Boss. no. 148 

 (on Atriplex nitens), and finds them to be identical. The same 

 well-marked scars are also shown by specimens on Chenopodium 

 rubriim, jjublished by S\"dow, Mycoth. March, no. 1195 as Hamu- 

 laria duhia, which ajjpears to be merely a younger state of the same 

 species. 



Explanation of Plate 550. 

 (All figTiresXGOO, unless otherwise described.) 



1. Mi/rosphaerella Cydonise, asci and spores. 



2. Leptosphanfia Galiori(m. f. Dipsaci, ascusX200, and spores. 



3. Srlerophoma pUhya ', twip of Pino, n. s. ; a, sing-le pustule X IS ; h, spores. 



4. Phomopsis alnea, spores and sporophores. 



