HYPOCRBLIiA AND ASOHERSONIA. 195 



from Martinique. Berkeley's specimen was sterile, the Caracas 

 specimen ascigerous, and the Martinique specimen conidii- 

 ferous. 



In section the ascigerous stroma is seen to consist of super- 

 posed concentric zones, and its constituent hyphae are thickened, 

 refringent, and gelatinous. The perithecia are confined to a 

 zone about 1 mm. thick at one end of the stroma, and their 

 ostiola resemble the pores of a Polyporus. This ascigerous 

 area is surrounded by the remains of a filamentous mycelium. 

 The perithecia are narrow and deep, and contain cylindrical 

 asci and abundant paraphyses. The ascospores are filiform 

 and (?) septate. 



The conidial stroma, like the sterile and ascigerous forms, 

 is surrounded by a white mycehum. In section it is found 

 to consist of a white basal part, a cortical zone, and an inter- 

 mediate softer tissue. The intermediate tissue is composed 

 of numerous tubes which run from the base to the cortex. 

 These tubes are lined with clavate basidia, which bear brown, 

 spherical, verrucose spores, 3 jx diameter. Patouillard refers 

 to this as a Ceriomyces form of the ascomycete. 



The details given above are quoted from Patouillard's 

 paper (Bull. Soc. Myc. France, VI., p. 106). In 1891 Atkinson 

 published a paper in which he dissented from Patouillard's 

 determination, and described Berkeley and Ravenel's species 

 as Hypocrella tuheriformis (Berk. & Rav.) Atk., nee Dussiella 

 Pat. Atkinson described the stroma as stratose, at first 

 clothed with hyphae, which bear hyahne conidia, 7-10 X 

 3 • 5-4 [I. The perithecia are sessile or with the base immersed, 

 and the ascospores are filiform, multiseptate, finally separating 

 into part-spores. 



Rick has recorded further details concerning Dussiella. 

 He states that the fungus appears to be merely epiphytic. 

 At first it is white and covered with a conidial layer, but 

 becomes red-brown later. He describes the stroma as white 

 internally, and does not mention any zonation. With regard 

 to the ascospores, he states that they remain undivided even 

 after their extrusion from the ascus. Paraphyses were present 

 in the perithecia. According to Rick, the conidial stage of 

 Dussidla belongs to the Stilbacess. 



