The
thallus of
Fissurina khasiana is greyish-green in colour, with a smooth and cracked surface that appears . Its
ascomata, or fruiting bodies, are in form and measure 2–4 mm in length and 0.1 mm in width. They can be simple or irregularly branched, immersed, and end in a sharp or somewhat acute tip. The of the ascomata is narrow, black, and indistinct. The is present at the base, non-striate, and non-, with a round and somewhat puffed appearance. It is mostly convergent to slightly divergent and covered by a up to the top. The
hymenium is
hyaline, not , and ranges from 80 to 100
μm in height. The is also hyaline. are simple, long, and thin, with slightly elongate, warty tips. are short and mostly smooth, occasionally having warty tips.
Asci are cylindrical, 6–8-spored, and measure 50–60 by 6–8 μm. The ascospores are
ellipsoidal with 3 transverse
septa, and measure 16–19 by 8–10 μm and a 1.6–2 μm-thick . Chemical
spot tests reveal that the thallus of
Fissurina khasiana has K+ (yellow-red), C−, KC−, P+ (orange), and UV− reactions. The lichen contains both
constictic and
stictic acids. The ascomatal structure of the species is considered to be of the "comparilis-type." However,
Fissurina khasiana is distinct from other species in this group due to the presence of both stictic and constictic acids in its thallus.
Fissurina khasiana has an ascomatal structure that is intermediate between
Fissurina inquinata and
F. triticea. It is distinguished by its relatively minor "puffing" and a non-carbonized exciple, setting it apart from both
F. inquinata, which has little "puffing" and a carbonized exciple, and
F. triticea, which has strongly "puffed" ascomata and a non-carbonized exciple. Additionally,
Fissurina triticea has larger and more rounded ascospores, measuring 15–20 by 10–15 μm. ==References==