ULTRASTRUCTURAL OBSERVATIONS ON A MARINE LIGNICOLOUS ASCOMYCETE - BOVICORNUA-INTRICATA GEN ET SP-NOV

Bovicornua intricata sp.nov. is described from driftwood found at Marl oes, South Wales, U.K. and Stenbjerg, Jutland, Denmark and compared wi th species of Ceriosporopsis Linder. Bovicornua intricata is separated from Ceriosporopsis species by the greater complexity of the structur e of the appendaged ascospores. In ascospores of B. intricata, the exo sporic wall layer enrobes both the spore wall and the polar appendages which arise as outgrowths of the spore. The exosporium is bipartite, the inner region has regular, parallel electron-dense lamellations tha t radiate from the episporium. The outer region of the exosporium cons ists of electron-dense fibrillar material at which the lamellae termin ate.