6 



Mycologia 



Ramularia Unger 

 Ramularia Mimosae sp. nov. 



Fig. 8 



Conidiophores amphigenous, more abundant above. Spots in- 

 definite, the whole affected leaf portion covered with a conspicu- 

 ous whitish coating of the conidia and conidiophores. Condio- 

 phores in clusters of from ten to thirty -|- from the stomata, hya- 

 line, short, about ly^^jx, unbranched, continuous. Conidia 

 hyaline, 24-37 X 3-5 ft, several-septate, straight or crooked, taper- 

 ing to each end, obtuse. 



On Mimosa pudica, Goamo Springs, 8^6^ (type), Penuelas, 

 721^, Arecibo-Lares road, 72^8, Mayaguez, yiio, Lajas, 7158. 

 This fungus is very common in Porto Rico and to the naked eye 

 has all the appearance of an Oidium. It is quite distinct from 

 Cercosporella Mimosae Sacc. 



Haplographium B. & Br. 

 Haplographium portoricense sp. nov. 

 Fig. p 



Fungus superficial, forming diffuse, sooty spots on the leaf sur- 

 face, epiphyllous or hypophyllous. Mycelium fine, 1.5 — •1.7 /a, 

 pale-yellow, forming a loose network over the leaf. Conidiphores 

 arising directly from the mycelium, black, usually in small, 3-10, 

 clusters, about 170/x high, 7/x thick, straight, rigid, septate, pale 

 at tip, sometimes with few lateral branches. Apex branching as 

 in Penicillium. Conidia ovoid, continuous, dark-colored, 17-20 

 X7-io/^- 



On Canna, El Gigante, 84^5 (type), Canna coccinea, Aibonite, 



8447. 



The fungus appears to be strictly superficial and in general 

 appearance is a sooty mold. The mycelium where it aggregates 

 and gives rise to a cluster of conidiophores is much darker than 

 the ordinary vegetative mycelium but is no greater in diameter. 

 The conidiophores, however, are much thicker, about three times 

 as thick as the mycelium. 



The description is drawn from epiphyllous material. When 

 hypophyllous, marked variations occur, such that were the speci- 



