Seeds of South Australia
Eucalyptus macrorhyncha ssp. macrorhyncha (Myrtaceae)
Red Stringybark
List of species for Eucalyptus
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Seed collecting:
January to December
Herbarium region:
Northern Lofty
NRM region:
Northern and Yorke
IBRA region
Broughton (FLB02)Flinders Lofty Block
 Vulnerable   (IUCN: VU B2b(iii)c(ii,iv))   (Definite Decline)   [Endemic to BR in SA, in eastern states; mostly in Spring Gully; threatened by climate change. Two thirds of pop appeared dead in May 2008 - M O'Leary.]
RSCA map:
Regional Species Conservation Assessments per IBRA subregion. Please click the thumbnail map.
AVH map:
Australian distribution map (external link)
SA Census:
Census of South Australian plants (external link)     [genus Eucalyptus]
Name derivation:
Eucalyptus from the Greek 'eu' meaning well and 'calyptos' meaning covered; alluding to the cap or lid which covers the stamens in the bud. Macrorhyna from the Greek 'macros' meaning large and 'rhynchos' meaning snout or beak; referring to the distinctive beaked bud-caps.
Distribution:
Found only in a small area in the mid-north in South Australia, growing on gravelly loams in hilly terrain. Also found in New South Wales and Victoria.
Status:
Native. Rare in South Australia. Common in the other states.
Plant description:
Single or multi-stemmed tree to 30 m high with rough fibrous and string grey-brown to red-brown bark. Juvenile leaves ovate to broad-lanceolate, rough with short bristles, dull to glossy green. Adult leaves to 150 mm long and 35 mm wide, lanceolate to slightly curved,  glossy green. Inflorescences axillary in groups of 7-11 flowers held erect. Buds to 9 mm long and 5 mm wide, diamond-shaped, bud-cap with a long beak, equal in length to the base. Flowers white appearing in autumn and winter. This species is distinguished from the other stringbarks found in South Australia (E. arenacea, E. baxteri and E. obliqua) which have round to blundley cone-shaped, non-beaked bud-cap.
Fruit type:
Woody round fruit to 10 mm long and 12 mm wide, individually stalked, disc broad, ascending, valves 3 or 4 strongly above the rim.
Seed type:
Dark brown to black irregularly pyramidal seed to 2 mm long and 1.5 mm wide, with angled sides and covered in fine wrinkles.
Embryo type:
Folded.
Seed collecting:
Collect mature fruits that are dark and hard (difficult to break with a finger nail), with the valves un-open any time of year.
Seed cleaning:
Leave the fruits in a breathable container in a dry room for one to two weeks. This allows the valves on the fruit to open and release the seeds. Separate the seeds by placing all the materials into a bucket and shaking it to dislodge the seeds. Pass the material through a sieve to separate the unwanted material. The finer material will contain both seeds (soft) and frass (hard) usually distinguishable from each other but can be very similar in shape and colour. With finer sieves, the seeds can be separated from the frass but this is not essential for storage or propagation. Store the seeds with a desiccant such as dried silica beads or dry rice, in an air tight container in a cool and dry place.
Seed viability:
From two collections, the seed viability were low, ranging from 3% to 45%.
Seed germination:
Seeds are non-dormant, viable seed should germinate readily.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
July 20153%7dNA None
1% water agar
12 hrs light / 12 hrs dark  /  20 °C constant
Result: Maximum percentage of germination observed.
T0: Number of days before first germinant observed.
T50: Number of days to achieve 50% germination.
Pre-treatment: The initial treatment that the seeds received prior to placement on germination media.
Germination medium: The substrate that seeds were placed on for the duration of the germination experiment.
Incubator conditions:
Photoperiod: The duration of light exposure that the seeds were subject to during a 24 hour period.
Thermoperiod: The constant or diurnal temperatures that seeds were subject to during a 24 hour period.
Winter conditions: 15°C 20 h (3am→11pm); 5°C 4 h (11pm→3am) / 10 h light (8am→6pm); 14 h dark (6pm→8am)
Spring/Autumn conditions: 22°C 12 h (8am→8pm); 10°C 12 h (8pm→8am) / 12 h light (8am→8pm); 12 h dark (8pm→8am)
Summer conditions: 30°C 14 h (6am→8pm); 15°C 10 h (8pm→6am) / 14 h light (6am→8pm); 10 h dark (8pm→6am)