(First upload on September 12 2009. Last on June 13 2022) [ 日本語 | English ]

Phyllospadix iwatensis Makino

Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily

Zosteraceae (アマモ, seagrass)

[Engler's syllabus エングラー体系]
Engler did not establish this family (⇒ Potamogetaceae)
Ten or more species in two genera → living in sea
Zostera L. (アマモ, grass-wrack)
Phyllospadix Hooker (スガモ, surfgrass)
Body: dioecism
Leaf margin: serrulated
Two species (and one hybrid):
P. iwatensis Makino (スガモ)
P. japonicus Makino (エビアマモ), not in Hokkaido
P. × choshiensis Miyata et Ohba (ヒメスガモ)
Heterozostera (Setchell) Hartog
Usually treated as Zostera

Phyllospadix iwatensis in Hokkaido

Sugamo (スガモ, 菅藻), surfgrass
Lifeform: perennial seagrass
Distribution: north China - Korea - Japan
Habitat: reefy zone (seashore, 海浜)

⇔ silt (sand and mud) = Z. marina
一般教育演習 海と湖と火山と森林の自然

Seed dispersal: water
  • Makino, T. 1931. A contribution to the knowledge of the flora of Nippon. Journal of Japanese Botany 7: 15-18

[1] a beached specimen. [2] close-up to roots. Along Charatsunai seacoast near Muroran Marine Station (see below) on Sept. 7 2009. [3] a specimen collected at Aikappu Cape (愛冠岬), Akkeshi, eastern Hokkaido, on June 21 1982. [4] a specimen collected at Denshinhama Coast, Muroran, on May 25 1982.

[3] the landscape of Charatsunai seacoast. [4] a supervisor, Dr. Nagasato, the Madonna of the Japanese Society of Phycology, at a field trip. (September 7 2009).