Fen Sedge

Foodplant / saprobe
superficial pseudothecium of Acanthophiobolus helicosporus is saprobic on dead leaf of Cladium mariscus
Remarks: season: 5-10

In Great Britain and/or Ireland:
Plant / epiphyte
fruitbody of Aleurodiscus delicatus grows on dying culm of Cladium mariscus

Foodplant / saprobe
clypeate perithecium of Anthostomella fuegiana is saprobic on Cladium mariscus
Remarks: season: 1-9

Foodplant / saprobe
clypeate perithecium of Anthostomella leptospora is saprobic on Cladium mariscus
Remarks: season: 4-12

Foodplant / saprobe
clypeate perithecium of Anthostomella scotina is saprobic on Cladium mariscus
Remarks: season: 4-12

Foodplant / saprobe
colony of Arthrinium dematiaceous anamorph of Arthrinium phaeospermum is saprobic on dead leaf of Cladium mariscus
Remarks: season: esp. 7-8

Foodplant / saprobe
basidiome of Ceratellopsis aculeata is saprobic on dead, decayed culm of Cladium mariscus
Other: sole host/prey

Foodplant / saprobe
short-stalked apothecium of Dasyscyphus imbecillis var. cladii is saprobic on Cladium mariscus
Remarks: season: 7

Foodplant / saprobe
effuse colony of Dictyosporium dematiaceous anamorph of Dictyosporium toruloides is saprobic on dead stem of Cladium mariscus
Remarks: season: 1-12

Foodplant / saprobe
immersed pseudothecium of Didymopleella cladii is saprobic on dead stem of Cladium mariscus
Remarks: season: 12-6

Foodplant / saprobe
apothecium of Hymenoscyphus robustior is saprobic on dead stem of Cladium mariscus
Remarks: season: 6-7

Foodplant / saprobe
immersed, becoming exposed by lifting of operculum apothecium of Hysterostegiella fenestrata is saprobic on dead stem of Cladium mariscus
Remarks: season: 8

Foodplant / saprobe
apothecium of Lachnum controversum is saprobic on dead stem of Cladium mariscus
Remarks: season: 5-10
Other: minor host/prey

Foodplant / saprobe
fruitbody of Marasmius cornelii is saprobic on dead, wet leaf sheath of Cladium mariscus
Other: sole host/prey

Foodplant / saprobe
effuse colony of Tetraploa dematiaceous anamorph of Massarina tetraploa is saprobic on Cladium mariscus
Remarks: season: 1-12
Other: major host/prey

Foodplant / saprobe
immersed or erumpent pseudothecium of Massariosphaeria typhicola is saprobic on dead leaf of Cladium mariscus
Remarks: season: 2-5

Foodplant / saprobe
sessile apothecium of Mollisia caricina is saprobic on dead leaf of Cladium mariscus
Remarks: season: 8-12

Foodplant / saprobe
thyriothecium of Morenoina minuta is saprobic on dead sheath of Cladium mariscus

Foodplant / saprobe
thyriothecium of Morenoina paludosa is saprobic on dead sheath of Cladium mariscus

Foodplant / saprobe
immersed pseudothecium of Paraphaeosphaeria michotii is saprobic on dead leaf of Cladium mariscus
Remarks: season: 1-7

Foodplant / saprobe
colony of Periconia dematiaceous anamorph of Periconia curta is saprobic on dead stem of Cladium mariscus
Remarks: season: 1-12

Foodplant / saprobe
colony of Periconia dematiaceous anamorph of Periconia digitata is saprobic on dead leaf of Cladium mariscus
Remarks: season: mainly winter

Foodplant / saprobe
effuse colony of Periconia dematiaceous anamorph of Periconia laminella is saprobic on dead stem of Cladium mariscus

Foodplant / saprobe
acervulus of Pestalotiopsis coelomycetous anamorph of Pestalotiopsis disseminata is saprobic on dead leaf of Cladium mariscus

Foodplant / saprobe
effuse colony of Chalara dematiaceous anamorph of Phaeoscypha cladii is saprobic on dead leaf of Cladium mariscus
Remarks: season: 1-12

Foodplant / saprobe
fruitbody of Phlebiella paludicola is saprobic on dead, decayed leaf (basal) of Cladium mariscus
Other: major host/prey

Foodplant / saprobe
fruitbody of Pseudotomentella mucidula is saprobic on dead, decayed leaf of debris of Cladium mariscus
Other: unusual host/prey

Foodplant / parasite
telium of Puccinia cladii parasitises live leaf of Cladium mariscus

Foodplant / saprobe
superficial thyriothecium of Schizothyrium pomi is saprobic on dead stem of Cladium mariscus

Foodplant / saprobe
effuse colony of Sporidesmium dematiaceous anamorph of Sporidesmium cladii is saprobic on dead leaf of Cladium mariscus
Remarks: season: 2-12

Foodplant / saprobe
effuse colony of Sporidesmium dematiaceous anamorph of Sporidesmium paludosum is saprobic on dead stem of Cladium mariscus
Remarks: season: 5

Foodplant / saprobe
scattered, subepidermal, fuscous pycnidium of Stagonospora coelomycetous anamorph of Stagonospora caricis is saprobic on dead leaf of Cladium mariscus
Remarks: season: 1-12

Plant / resting place / on
fruitbody of Tomentella radiosa may be found on dead, decayed debris of Cladium mariscus
Other: unusual host/prey

Foodplant / saprobe
sporodochium of Volutella anamorph of Volutella arundinis is saprobic on dead leaf of Cladium mariscus

Perennial, to more than 1 m, forming large pure stands. Rhizome creeping or stoloniferous, sturdy. Stem to c. 6 mm diam., with more than 10 internodes, terete, hollow, smooth, grey green. Leaves arranged spirally along whole stem length, up to nearly equalling stem; basal sheaths, e.g., 15 cm, hard, persistent, grey-brown or blackish brown; ligule 0; blades often more than 50 cm, 5-9 mm wide, unifacial, flat or folded, grey-green, midrib below and margins sharply scabrous, apex long-attenuate, trigonous, scabrous. Inflorescence of partial inflorescences in more than 6 leaf axils, upper overlapping; bracts much longer than partial inflorescence, except at stem apex; partial inflorescence a compound anthelodium, occasionally much elongated, to 15 x 10 cm, peduncle to 25 cm; primary branches (0-) 25-100 mm, secondary branches to 35 mm, ending with cluster of spikes or tertiary anthelodium, tertiary branches to 15 mm, mostly ending with cluster of spikes; ultimate branches with bracts, 3-5 mm, and tubular prophyll; cluster of spikes by 3-14, mostly sessile spikes; spike fusiform, c. 4 mm, glume-like bract c. 1 mm, glume-like prophyll c. 1 mm; lowest 2-3 glumes sterile, 1.2-3 mm, in axil of 4th glume a unisexual flower with two stamens (occasionally bisexual); in axil of 5th glume a bisexual flower with, mostly, two stamens and pistill, mostly tristigmatic. Nut 2.9-3.3 x 1.4-1.6 mm, fusiform, yellow brown, smooth, glossy, base more or less differentiated disc, apex conical.

Schoenus mariscus L., Sp. Pl. 1: 42. 1753.

Cladium mariscus is a species of flowering plant in the sedge family known by the common names swamp sawgrass, great fen-sedge, saw-sedge or sawtooth sedge. Previously it was known as elk sedge. It is native of temperate Europe and Asia where it grows in base-rich boggy areas and lakesides. It can be up to 2.5 metres (8 ft 2 in) tall, and has leaves with hard serrated edges. In the past, it was an important material to build thatched roofs; harvesting it was an arduous task due to its sharp edges that can cause deep lacerations.