NE^V on NUTEWOHTHY FUXGT 1G9 



gelatinised tissues, and surrounding a central columella from which 

 the spores are hasipetally diii'erentiated. A species of the genus 

 (C. ciiif/eiis DcToni) has already been recorded on Liuaria vulgaris, 

 from near Llangollen, 1908. 



374. TiLLETiA HoLCi Sacc. Syll. vii. 484, note. Eostr. in Bot. 

 Tids. xxii. 25G. Jackson in Mycologia, xii. 150. 



Fohjcystis Rolci Westd. in Bull. Acad. Roy. Belg. ISGl, vol. xi. 

 p. 051, no. 40, Hg. 1. Tllletia Rauweiihojfii Fisch. Waldh. Aper^. 

 S^^st. Ust. 1877, p. .50. Massee, Mild. Jiusts & Smuts, p. 195. 

 McAlpine, Smuts of Australia, p. 192, pi. 49, figs. 178-9. 



On Holcus mollis, Walton Heath, Surrey, Aug. 1919 (Mr. E. 

 W. Mason). 



This si)ecies was described and accurately figured (on a small 

 scale) by AVestendorp in 1861, but no figure seems to have been 

 published in Europe since his time. His figure, for its size, is very 

 good, and his description, taken in conjunction with his figure, is even 

 better than the desci-iption given fifty-three years later in the 

 English work, in which there are two very inconsistent misleading 

 statements: — (1) that the meshes of the network average 3-4 /x 

 across (this should be G /x), and (2) that there are only 4-6 areola? 

 present on a hemisphere (this should be 16-24). The sketches given 

 here (fig. 20) are taken from the specimens in Herb. Kew, collected in 

 Ireland by G. H. Pethybridge in 1919 ; these agree with those 

 of Dr. McWeeney, collected in 1896, which Massee himself examined. 

 This sj^ecies was found in 1914-5, by Mr. H. S. Jackson, on Holcus 

 lanatus in Oregon (first time in North America). 



375. DoASSAis-siA LiMOSELL^ Schrot. Krypt. Flor. Schles. iii. 287. 

 Protomyces Limosellce Kunz. in liabenh. Fung. Eur. no. 1694 



(1873). Entyloma LimoscllcBWint. 



Pustules of spore-balls blackish brown, amphigenous, roundish, 

 150-300^ wide, densely scattered, sometimes collected into larger 

 heaps on discoloured spots 1-2 mm. wide, at first covered by the 

 epidermis, then erumpent. Spore-balls oval, brown, 60-100 yu, long, 

 surrounded b}^ a thin indistinct brownish membrane ; spores oval or 

 roundish, clear transparent pallid-brown, 9-11^ diam., sometimes 

 granular within. (Fig. 19.) 



On leaves and petioles of Limosella aquatica, on dried-up mud 

 of Earlswood lieservoir, Oct. 1921. 



This parasite occurred in considerable quantity on the plants of 

 Limosella which sprang up all over the expanse of dried mud, 

 exposed in the bed of Earlswood Beservoir after the great drought of 

 1921. In October there was very little water left in the Reservoir^ 

 and the mud-surface on which the Limosella grew was about 10-12 

 feet below the ordinary level of the water. The spores of the Doas- 

 sansia were in active germination, giving off a iDromycelium which 

 bore at the summit a whorl of (usually) four basidiospores. These 

 were conjugating freely with one another in pairs. There were also 

 great numbers of elongated filiform secondary spores in the same 

 pustules. 



