TWO REMARKABLE ASCOMYCETES. 429 



The development of the lobe.s is progressive; and while they are ac- 

 tively growing, a considerable portion of their tips may show no 

 developed perithecia, while further back, and at the center, the latter 

 may be mature. The growth is, nevertheless, not unlimited; and 

 after reaching a certain stage of maturity, the whole upper surface is 

 perithecigerous to the very extremities. 



In view of the characteristics above enumerated, which are common 

 to the two species by which it is represented, the genus Hypocreopsis 

 might be defined as follows: 



Hypocreopsis Karsten. 



Stromatibus orbicularibus, radiatim lobatis, lobis lichenoideis, 

 ramosis, substrato adhaerentibus: infra nigro-limitatis, supra denique 

 ubique perithecigeris: peritheciis in stromate denso immersis, strato 

 singulo dispositis, subsphericis, collis suffultis: ascis cylindraceis 

 octosporis: sporidiis discretis vel arete cohaerentibus, typice uni- 

 septatis. 



Hypocreopsis Rhododendri nov. sp. 



Stromatibus subaurantiacis, vel testaceo-cervinis vel cinnamomeis, 

 orbicularibus, latitudine usque ad 10 cm., lobis numerosis, substrato 

 arete cohaerentibus, repetito-subdichotomis, 2-3 mm. altitudine; infra 

 nigro-limitatis, 1.5-2 mm. latis; supra undique perithecigeris, 2-4 nun. 

 latis. Peritheciis subsphaericis, 200-220 ix diam., collis 125 ii longis 

 suffultis, ascis cylindricis, octosporis, 115-130 X 14 /x, apice rotun- 

 dato-acuminatis, sporidiis sphaericis vel late ellipticis 12 X 12-17 X 

 13.5 /x, continuis \(A typice medio septatis, discretis vel saepissime 2-8 

 arete cohaerentibus, hyalinis vel dilute luteis, levibus vel subrugulosis. 



On stems and branches of Rhododcndrum maximum. North 

 Carolina, East Tennessee. 



The second peculiar form to be considered was first noticed early in 

 August, 1903, on McdcoUi virginica at IMagnolia Mass., by Dr. Farlow; 

 who called my attention to the fact that, altliough the material was 

 quite sterile and merely formed, just below the leaf whorls, a sub- 

 fusiform distortion which was covered by the uninjured epidermis, 

 the tissues in this region were penetrated by a fungus mycelium com- 

 posed of branching septate hyphae, about 4-5 n in diameter, which 

 penetrated the host cells. The same form was collected by myself on 



