Isaria friesii  

Anamorph: Fruit-bodies to 700 µm in height and 80 µm diam., cylindrical and pointed, sometimes branched like antlers, pale yellow and sometimes appearing slightly felty, erumpent, composed of an inner core of interwoven hyphae 1.5-2 µm diam. within a gelatinous matrix and an outer layer of vertically arranged hyphae with swollen tips. Conidiophores not clearly distinguished. Conidiogenous cells 18-28 x 3-4 µm at the base, ± cylindrical but irregular and usually slightly tapering, fairly thick-walled, apiculate, ocasionally branched, proliferating sympodially with very prominent denticles. Conidia  7-9.5 x 3-3.5 µm, cylindrical to clavate, the apex rounded and the base acute and often attenuated, usually developing a ± median septum, thin-walled, hyaline, smooth, without a gelatinous sheath or appendages.

Teleomorph: Stromata absent. Ascomata apothecia, 600-1000 µm diam. and 200-250 µm thick, discoid, short-stalked, erumpent, pale yellow, mintely downy or with scattered short hairs, the cup with an outer layer of thick-walled interwoven hyphal cells and a gelatinous medulla similar to that of the anamorph. Hymenium 45-55 µm in height. Interascal tissue of copious simple paraphyses 1-1.5 µm diam. with globose to pyriform tips 4-5 µm diam. Asci 32-35 x 7-8.5 µm, cylindrical to clavate, thin-walled, short-stalked to almost sessile, without croziers, the apex rounded to truncate and slightly thickened but apparently without an apical ring, not blueing in iodine, 8-spored. Ascospores 6.5-9 x 3.5-4.5 µm, cylindrical to clavate, fairly thick-walled, developing a ± median septum, smooth, apparently without a gelatinous sheath or appendages.

The  description is based on dried, rehydrated material.