242 



Mycologia 



diameter from 180-210/x. From sections of material fixed in 

 chrom-acetic acid and stained with Haidenheim's iron-alum-hae- 

 matoxylon, the parenchymatous character of the pycnidium wall 

 was very apparent {pi. ^2, j. j). 



The spores are oval or elongate, 24-34 X 15-18/x, very densely 

 granular and with several prominent guttulae (/>/. ^2, f. 2). 

 They are not surrounded by a mucilaginous envelope so as to 

 cause them to come out of the pycnidium in ropes or chains, but 

 are extruded singly. Quite frequently, when a pycnidium is 

 crushed or torn open, a portion of the short sporophore remains 

 attached to the spore. 



The points of difference between the species on Viscum album 

 and this species on Phoradendron flavescens are shown in the 

 following tabulation : - 



Elliptic and slightly con- Elliptic and extruded 

 stricted at the middle, ex- singly 

 truded in strands, held 

 together in a mucilaginous 

 matrix 



These differences, together with the difference of hosts, would 

 warrant a specific rank ; hence the name Macrophoma Phoraden- 

 dri is proposed for this new species, a technical description of 

 which follows : 



Foliis initio flavescentibus demum atro-brunneis ; pycnidiis am- 

 phigenis, sparsis, globosis, brunneis, primo innatis dein ostiolo 

 perforantibus, 180-210/x, contextu parenchymatico constitute; 

 sporulis oblongis vel ellipsoideis, utrinque rotundatis, plasmate 

 granuloso farctis, continuis, hyalinis, 24-34 X 15-18^^ basidiis 

 brevibus suffultis. 



Hab. in foliis vivis Phoradendri flavescentis quae desidere 



faciunt. 



Type specimen. No. 3192, Myc. Herb. Dept. Bot., Univ. of 

 Texas, Austin, Texas. 



School of Botany, 



University of Texas, 

 Austin, Texas. 



Ostiolum 

 Pycnidia 

 Spores 



Macrophoma Visci 

 absent 



300-400JU, diam. 

 43-66 X 18-21/X 



Macrophoma Phoradendri 

 present 

 i8o-2iO(U diam. 

 24-34 X 15-18/U 



Macrophoma Phoradendri sp. nov. 



