Stevens & Dalbey : New Porto Rican Fung 5 



Septoriopsis Piperis sp. nov. 



Figs. 3, 4 



Spots irregular, definitely limited, i-2 cm. in diameter, infected 

 tissue dead, dirty-white, bordered by a thin purplish-brown line, 

 closely set with spore clusters. Mycelium internal, fine ; conidio- 

 phores in clusters of large numbers, of same diameter as spores, 

 aggregated into a sporodochium 45-60 /x, in diameter, about 90 ^u, 

 high. Conidia long, narrow, 68-165X3-4/^, many-septate, ob- 

 tuse, pale. 



On Piper medium, San German, 57p^ (type). 



This fungus is especially interesting, since it is close to both the 

 Melanconiales and the Moniliales. The conidiophore clusters 

 are so large, dense, and short that the group on mere superficial 

 examination might readily be regarded as an acervulus or even 

 as a pycnidium but might equally be regarded as a group of coni- 

 dial hyphae. The true relation is clearly shown only by micro- 

 tome section. The young tubercles are often solid, nearly spheri- 

 cal masses which develop subepidermally and later become erum- 

 pent. When of this form they superficially and even in section 

 look much like Septoria. 



ExospoRiUM Link 

 Exosporium Leucaenae sp. nov. 



Figs. 5, 6, 7 



Spots 2-4 mm. in diameter, circular, tawny, rather closely cov- 

 ered by sporodochia. Sporodochia hypophyllous, 1 10-240 /x in 

 diameter, 30-40 /x high, exclusive of the spores, almost or quite 

 flat-topped. Conidiophores barely tawny, much lighter in color 

 than the spores, simple or branched toward the tip, thick, obtuse. 

 Conidia clavate, brown, three or more septate, 58 X 8 obtuse, 

 often tapering to one end. 



On Leucaena glauca, Arecibo, d/pi* (type), Vega Baja, 42^5, 

 Manati, 5265, Quebradillas, 5122, Aguada, 5076. The fungus 

 would fall in the genus Helminthosporium but for the sporo- 

 dochial character. The condiophores are, however, closely com- 

 pacted into a true tubercular structure which, except for height, 

 might be regarded as a coremium. To the naked eye the sporo- 

 dochia look much like the sori of a rust. 



