Collema japonicum (Müll.Arg.) Hue
Synechoblastus japonicus Müll. Arg., Flora 63: 17 (1880).
Thallus rather large, to 10 cm diam., though usually less, foliose, membranous, thin, rounded or somewhat irregular, adnate or partly ascending ± deeply and broadly lobate, smooth or sparsely and irregularly ridged or pustulate and folded, sometimes creased, rarely isidiate, darker or paler olive-green, lower surface paler often bluish, matt or slightly glossy. Lobes few, rounded to somewhat extended, imbricate, ± sparsely lobulate, lobules rounded or a little extended, imbricate, 0.5-1 cm broad, margins entire or slightly incised or sparsely isidiate, slightly undulate or bent upwards or downwards, never swollen. Isidia rather rare, sparse, mostly marginal or at damaged spots, often globular when young, squamiform at maturity, rarely terete. Apothecia ± numerous, laminal, rarely marginal, scattered or crowded, sessile, constricted at base, sometimes broadly stipitate, 0.7-2 mm diam., disc plane to convex, pale or dark red, matt to slightly glossy, epruinose, thalline margin thin, entire, smooth or finely rugose, not prominent, persistent, or in convex fruits disappearing, proper margin thin, pale. Ascospores 8 per ascus, ± distichous and imbricate, fusiform, seldom broadly acicular, straight or somewhat curved, with acute and often extended ends, 6-celled rarely 4- or 7-8-celled, (20-)30-56(-78) × (4-)4.5-8.5 µm. Pycnidia common and numerous, laminal, also marginal, immersed, globose to somewhat flattened, thicker than thallus, 200 µm diam.
S: Known from one collection from Glen Lyon Station, Canterbury (Mason 101, OTA). It is mainly a corticolous species but will also colonise rock.
Western Pacific
