Ontogeny of the Needle Cast Fungus, Hypodermella arcuata
- 1 March 1966
- Vol. 58 (2) , 192-+
- https://doi.org/10.2307/3756959
Abstract
Hypae of H. arcuata (Hypodermataceae, Ascomycetes) penetrate the endodermis of Pinus monticola needles and tissues external to it. Stromatic tissue between the hypodermis and epidermis, the 1st macroscopic sign, is visible on needles in April or May. Differentiation in the stroma begins with orientation of hyphae perpendicular to the dermal tissues. These hyphae appear at maturity to be paraphyses, but initially are apically attached to the stroma. Pseudo-parenchymatous tissue surrounding the centrum becomes compressed forming a wall Unitunicate asci develop from the basal pseudoparenchy-matous tissue. The host''s epidermis and the upper stromatic tissue cover the hymenium until maturity, when they split, to expose the hymenium. The 8 sheathed uninucleate ascospores in each ascus are forcibly ejected when the ascocarp absorbs water. Ascospores germinate by short germ tubes, and form appressoria.This publication has 0 references indexed in Scilit: