150 SEMI-CENTENNIAL OF TORREY BOTANICAL CLUB 
In naming this distinctive species the senior author takes it 
upon himself to use the name of Mr. J. R. Johnston in recognition 
of the important service he has rendered mycology in making 
known the rust flora of Cuba. It was at his suggestion that this 
summary of present knowledge was undertaken, the first attempt 
made to give a full list of Cuban rusts. And it has been through 
his untiring efforts in securing material and making observations 
that this considerable showing is possible. More than one third 
of the number (40 species) is based entirely upon material supplied 
by Mr. Johnston, and nearly two thirds of the total number of 
collections are by him. In addition to this, and even more im- 
portant, he has made many observations which have added to our 
knowledge of life histories of different species. 
87. PUCCINIA CONCRESCENS Ellis & Ev.; Arthur, Mycologia 7: 
240. 1015. i 
Puccinia compacta Kunze; Bubak, Hedwigia Beibl. 42:30. 1903. 
Not Berk. 1855, de Bary 1858, or Thüm. 1875. 
ON ASCLEPIADACEAE: 
Asclepias curassavica L. 
This rather common rust of tropical America has not yet been . 
secured in Cuba by a mycological collector, but occurs on a speci- 
men in the phanerogamic herbarium of the N. Y. Bot. Garden, 
collected at Baracoa, Jan. 24-20, 1902, Pollard, Palmer & Palmer 
41; ; 
The species is short-cycled and а lepto-form. Тһе history of 
the name is reviewed in the Stevens list of Uredinales of Porto 
Rico (Mycologia 7: 240-242. 1915), where a description is given. 
88. PucciNIA Сокоговт Rav.; Berk. Grevillea 3: 54. 1874. 
ON ASCLEPIADACEAE: 
Philibertella clausa (Jacq.) Vail, Rio Gavelan (Prov. Santa 
Clara), March 26, 1910, Britton, Earle & Wilson 6022; 
Baracoa (Prov. Oriente), April 14, 1916, Johnston 553; 
Toa (Prov. Oriente), April 18, 1916, Johnston 552. 
The asclepiadaceous forms of rust intended to be covered by 
this name include those with dark sori and ellipsoid teliospores 
having the septum generally transverse. The species is not well 
defined. It is a short-cycled lepto-form, without pycnia. 
