439 



SPECIES TO BE TRANSFERRED TO H YALOIHDYM U 

 831. Phoma Rheea, Cooke. 



ASCOCHYTA R-HEAh, GroVi\ 



ycnidia scattered, round, covered by tlie epidermis, then 



emergent by the upper half, about 300 /i diam., blackish, at 

 length falling away and leaving a little white pit; texture thin, 

 soft, plectenchyinatous, brown. Spores oblong-ellipsoid, some- 

 what obtuse at the ends, biguttulate, for a long time continuous, 

 at length 1-septate, not constricted, 7-9 x 3-3*5 /i; sporophores 

 about as long as the spore. 



On dead stems of Boehmeria nivea, Assam and Kew Gardens. 



The British specimens correspond exactly with those from 

 Assam, no doubt having been introduced with the plant. Only 

 a few of the spores were distinctly 1-septate, but many showed 

 indications of becoming so. This species might be placed in 

 Diplodina, but it has the pycnidial texture of an Ascochyta; the 

 distinction between the two genera should lie in the texture ot 

 the wall of the pycnidium, not in the nature of the habitat. 



884, 



> 



Spots none. Pycnidia gregarious, subglobose, flattened, 

 ^rumpent and at length somewhat superficial, black, shining, 

 about 100 fx diam., with a minute ostiole in the centre; texture 

 of brown polyhedral cells, truly PhomaAike. Spores ovoid, 

 rounded at the ends, biguttulate, 5-7 x 2-2*5 fx; sporophores 



obsolete. 



(Herb 



Though all the spores seen were continuous, there were not 

 wanting indications (as by the constriction of numerous spores 

 in the middle) that they would ultimately become 1-septate. 



The srmnies wrmlrl thpm hplon.or to the wnus Diwlodina. 





SPECIES TO BE TRANSFERRED TO 



LEPTOSTROMACEAE. 



4 



842. Phoma hysteriiformis, Cooke. 



Pycnidia black, up to 500 jx long, densely gregarious and 

 frequently confluent, forming an elongated IJysterium-like 

 tubercle; mycelium arising in the epidermal cells, covered at 

 last only by their outer walls, but penetrating deeply into the 

 mesophyll, composed of thick-walled dark-brown parenchymatous 

 cells, somewhat radiating at the margin, enclosing a cavity 

 which is lined by the sporophores above and below. Spores more 

 or less ellipsoid, obtuse at both ends, colourless, cloudy within, 

 12-14 x 4-6 fx; sporophores short, oblong, erect, obtuse at apex, 

 pale brownish, sometimes transversely septate below, reminding 

 one of those of Piggotia astroidea, B. & Br. (Fig. 6, a.) 



On an herbaceous stem, Houston, Texas, legit Ravenel (Cooke, 



North Amer. Fung. no. 224!). 



Externally very like the less crowded specimens of Placo- 

 tphaeria Onobrychidis, var. anaxaea (Speg.) Keissl., as issued by 



