124 Journal of the Mitchell Society [June 



We have decided to let this go for the present in the genus Platygloea, 

 as it is certainly nearest that or Helicogloea Pat., which is very near 

 or more jn-obably the same, as MiiHer thinks. Our plant, however, has 

 basidia with only two or three cells, and the absence of sterile cells 

 mixed with the basidia is also a difference. It does not seem to agree 

 with any described species of the genus or with Helicogloea Lager- 

 heimi. Platygloea hlastoniijces Moller from South Brazil has basidia 

 entirely too long and slender, spores 6 x 12/x. Platygloea tiliae (Bref.) 

 Sacc, breaks through bark of Tilia ; basidia four-celled, spores 12 x 35ju,. 

 Platygloea Miedzyrzeceiisis Bres. is pulvinate, 2-4 mm. in diameter, 

 but the basidia are 3-5 septate, 4-6 x 75-200/x, the spores 7-9 x lO-lS/x. 

 (Ann. Myc. 1:113. 1903). 



4044. On corticated and decorticated branches of crepe myrtle (Lagerstroemia), 



January 28, 1920. Spores 3.7-4.5 x 5-7.5^. 

 4199. On corticated and decorticated branches of crepe myrtle, March '), 1920. 

 Type. 



2. Platygloea Lagerstroemiae n. sp. 



Plates 41 axd 54 



At first forming very small pustules up to 1.5 mm. broad 

 with indefinite margins which are usually crowded and denseh" 

 gregarious, often fusing later to form elongated, more or less nodu- 

 lated, irregular patches which may extend for 1-2 cm., not convoluted, 

 the surface dull and granular looking; color at first pallid dull white 

 or straw, soon sordid or smoky brown ; texture firmly waxy. Hymen- 

 ium composed of an immense number of small threads, formed by the 

 corymbose branching of the inner threads, among which are the much 

 thicker and elongated, curved basidia which also arise in corymbose 

 clusters of several. 



Basidia 5-5. 5|U, thick, elongated, irregularly curved and bent, usu- 

 ally two-celled, often with a slender basal cell which collapses soon ; 

 sterigmata terminal on each cell, ascending, long or short. The ba- 

 sidium begins to collapse while the spores are being formed and its 

 shape is very soon lost. Basidiospores oval or elliptic, usually curved, 

 very soon becoming irregular and often cycle-shaped b}' sprouting, 

 4-7.4 x 7.4-12.3/x, the secondary spores of the same shape, the smaller 

 sizes almost certainly secondary, the smaller secondary spores are 

 1.6-3.7 X 3-5.5;a. 



