Bryum (Spence, 2014)

Liu, Yong-Ying, Quan, Yu-Ping & Wu, Yu-Huan, 2021, A new moss species from northwestern China: Bryum glacierum (Bryaceae), Phytotaxa 510 (2), pp. 148-154 : 152

Key to bulbiferous species of Bryum in China

The following key includes all Bryum species producing axillary bulbils documented in China, including Bryum glacierum .

1. Axillary bulbils oval, without leaf primordia................................................................................................................ B. pachytheca

- Axillary bulbils obconic, ovate, or ellipsoidal, with conspicuous leaf primordia..............................................................................2

2. Bulbils with peg-like leaf primordia rising from the apex .............................................................................................. B. glacierum

- Bulbils with leafy primordia rising from near the base or mid-bulbil................................................................................................3

3. Small bulbils numerous per leaf axil; plants silver-green or white; distal lamina hyaline.................................................................4

- Large bulbils less than 5 per leaf axil; plants yellow-green, pale-green, green or reddish; distal lamina not hyaline.......................5

4. Hyaline in distal 1/2 to 2/3 of the leaf, short hair-point at the leaf apex, upper and median leaf cells rhomboidal; capsule inclined to erect ................................................................................................................................................................................ B. petelotii

- Hyaline in distal 1/3 to 1/2 of the leaf, long hair-point at the leaf apex, upper and median leaf cells rhombic; capsule pendulous ... ........................................................................................................................................................................................ B. argenteum

5. Bulbils (1) 2–4 per leaf axil; leaves with plane margins, costae percurrent to excurrent; upper and middle leaf cells elongaterhomboidal, elongate-hexagonal to linear-vermicular, more than 6:1 (length: width).......................................................... B. blindii

- Bulbils 1–2 per leaf axil; leaves with margins revolute proximally or to mid-leaf, costa excurrent as a stout awn; upper and middle leaf cells rhomboidal to elongate-hexagonal, usually 3–4: 1 (length: width) ....................................................................................6

6. Leaves triangular-lanceolate with revolute to mid-leaf margins; capsule necks strongly inflated, somewhat rugose, crown-like ..... ........................................................................................................................................................................................ B. coronatum

- Leaves ovate-lanceolate with proximally revolute margins; capsule necks slightly inflated, smooth, as thick as the urn.................. ..................................................................................................................................................................................... B. dichotomum